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American Academy of Pediatrics
Article

Chronic Sleep Curtailment and Adiposity

Elsie M. Taveras, Matthew W. Gillman, Michelle-Marie Peña, Susan Redline and Sheryl L. Rifas-Shiman
Pediatrics June 2014, 133 (6) 1013-1022; DOI: https://doi.org/10.1542/peds.2013-3065
Elsie M. Taveras
aDivision of General Academic Pediatrics, Department of Pediatrics, Massachusetts General Hospital for Children, Boston, Massachussetts;
bDepartment of Nutrition, Harvard School of Public Health, Boston, Massachussetts; and
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Matthew W. Gillman
bDepartment of Nutrition, Harvard School of Public Health, Boston, Massachussetts; and
cObesity Prevention Program, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachussetts;
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Michelle-Marie Peña
aDivision of General Academic Pediatrics, Department of Pediatrics, Massachusetts General Hospital for Children, Boston, Massachussetts;
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Susan Redline
dDivision of Sleep Medicine, Brigham and Women's Hospital, Boston, Massachussetts
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Sheryl L. Rifas-Shiman
cObesity Prevention Program, Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachussetts;
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Abstract

OBJECTIVES: To examine the extent to which chronic sleep curtailment from infancy to mid-childhood is associated with total and central adiposity.

METHODS: We studied 1046 children participating in a prospective cohort study. At age 6 months and yearly from age 1 to 7 years, mothers reported their children’s sleep duration in a usual 24-hour period. The main exposure was a sleep curtailment score from age 6 months to 7 years. The range of the total score was 0 to 13, where 0 indicated the maximal sleep curtailment and 13 indicated never having curtailed sleep. Outcomes in mid-childhood were BMI z score, dual X-ray absorptiometry total and trunk fat mass index (kg/m2), and waist and hip circumferences (cm).

RESULTS: The mean (SD) sleep score was 10.2 (2.7); 4.4% scored a 0 to 4, indicating multiple exposures to sleep curtailment between age 6 months to 7 years, 12.3% scored 5 to 7, 14.1% scored 8 to 9, 28.8% scored 10 to 11, and 40.3% scored 12 to 13. In multivariable models, children who had a sleep score of 0 to 4 had a BMI z score that was 0.48 U (95% confidence interval, 0.13 to 0.83) higher than those who had a sleep score of 12 to 13. We observed similar associations of higher total and trunk fat mass index and waist and hip circumferences, and higher odds of obesity (odds ratio, 2.62; 95% confidence interval, 0.99 to 6.97) among children who had a score of 0 to 4 vs 12 to 13.

CONCLUSIONS: Chronic sleep curtailment from infancy to school age was associated with higher overall and central adiposity in mid-childhood.

  • sleep curtailment
  • adiposity
  • fat mass index
  • BMI
  • obesity
  • early childhood
  • Abbreviations:
    CI —
    confidence interval
    FMI —
    fat mass index
    OR —
    odds ratio
    SS+TR —
    subscapular plus triceps skinfold thickness
  • What’s Known on This Subject:

    Curtailed sleep in children has been found to be associated with increased cardiovascular disease risk factors, including obesity. Few existing studies have examined measures of adiposity beyond BMI or have examined the effects of being chronically sleep curtailed.

    What This Study Adds:

    In this cohort of children who had research-level measures of sleep, BMI, total fat mass, and fat mass distribution, we found that chronic sleep curtailment from infancy to age 7 years was associated with higher overall and central adiposity in mid-childhood.

    Across infancy, childhood, and adolescence, evidence from multiple US and international studies suggests a consistent rapid decline in sleep duration ranging from 30 to 60 minutes over the last 20 years. 1 Some 2 but not all studies 3 , 4 suggest that the most pronounced decreases in sleep have occurred among children younger than 5 years of age, owing largely to later bedtimes. Recent studies also suggest that the quality of sleep among young children is often compromised, 5 and that pediatric sleep disturbances often become chronic. 6 , 7

    Curtailed sleep in children, defined as shortened sleep relative to average sleep duration, has been found to be associated with increased cardiovascular disease risk factors such as obesity, hypertension, and elevated hemoglobin A1c levels. Cross-sectional studies of older children and adults 8 – 19 and increasingly some longitudinal studies, including those of infants and children younger than age 5 years, suggest an inverse association between sleep duration and obesity and cardiovascular disease risk factors. 20 – 26 Few studies, however, have examined the effects of chronic or repeated sleep curtailment on adiposity outcomes in children and few pediatric studies have examined measures of adiposity beyond BMI. Furthermore, questions remain on whether there is a “critical period” in early childhood in which curtailed sleep is more highly associated with adverse anthropometric outcomes as has been suggested in the published literature. 21

    The purpose of this study was to examine (1) the extent to which chronic sleep curtailment throughout infancy to mid-childhood is associated with obesity, adiposity, and central fast mass distribution in a cohort of US-born children and (2) independent associations of curtailed sleep in each of 3 distinct age periods, infancy, early childhood, and mid-childhood, to determine whether there are critical periods for the development of associations between sleep and obesity. We hypothesized that being chronically sleep curtailed throughout infancy to mid-childhood would be associated with more adverse anthropometric indices. We further hypothesized that sleep curtailment in infancy would be associated with adverse adiposity and obesity outcomes at age 7 years and that the magnitude of the associations would decrease with age. A better understanding of the extent to which chronic curtailed sleep in early childhood affects overall and central adiposity could help support interventions to promote healthful sleep as part of childhood obesity interventions.

    Methods

    Subjects/Study Design

    Study subjects were participants in Project Viva, a prospective, pre-birth cohort study that recruited women during early pregnancy from Harvard Vanguard Medical Associates, a multispecialty group practice in eastern Massachusetts. 27 Details of recruitment and retention procedures are available elsewhere. 27 Of the 2128 women who delivered a live infant, 1683 children were eligible for 7-year (mid-childhood) follow-up, of whom 1116 attended a mid-childhood in-person visit. Because our main exposure was chronic sleep curtailment from age 6 months to 7 years, we excluded 70 participants who did not have sleep data for these time points. Thus, our sample size for analysis was 1046 children. Compared with the 1046 participants in this analysis, non-participants were less likely to have college-educated mothers (59% vs 71%) and to have annual household incomes exceeding $70 000 (52% vs 63%). Mean maternal age (31.3 years vs 32.3 years), however, was fairly similar.

    After obtaining informed consent, we performed in-person study visits with the mother at the end of the first and second trimesters of pregnancy, and with mother and child in the first few days after delivery and in infancy (median, age 6.2 months), early childhood (median, age 3.3 years), and mid-childhood (median, age 7.7 years). Mothers completed mailed questionnaires at 1, 2, 4, 5, and 6 years after birth. Institutional Review Boards of participating institutions approved the study protocols.

    Measurements

    Main Exposures

    At age 6 months and yearly from age 1 to 7 years, mothers reported their children’s sleep duration in a usual 24-hour period. At 6 months, we asked mothers: (1) “In the past month, on average, for how long does your baby nap during the morning?” (2) “In the past month, on average, for how long does your baby nap during the afternoon?” and (3) “In the past month, on average, how many hours does your baby sleep during the night?” Response options were in hours and minutes. At age 1 year, we asked, “In the past month, on average, for how long does your child sleep in a usual 24-hour period? Please include morning naps, afternoon naps, and nighttime sleep.” Response options were in hours and minutes. Between age 2 and 7 years, we asked parents to report the number of hours their child slept in a usual 24-hour period on an average weekday and weekend day in the past month. Response categories included “<9 hours, 9 hours a day, 10 hours a day, 11 hours a day, 12 hours a day, 13 hours a day, and 14 or more hours a day”; at age 7 years the response option was in hours and minutes.

    The main exposure was a sleep curtailment score from age 6 months to 7 years. We based the sleep score on mean sleep duration at each of the 8 measurement times: age 6 months and yearly from age 1 to 7 years. Using established thresholds from the published literature 28 of sleep durations that are associated with an increased risk for elevated BMI or obesity (BMI ≥95th percentile) in childhood, specific sleep duration cutoffs associated in crude analyses with increased obesity risk at age 7 years in the Project Viva cohort, and the National Sleep Foundation age-specific sleep recommendations, 29 we coded sleep duration at each time period as follows: from age 6 months to 2 years, score was 0 for <12 hours/day and 1 for ≥12 hours/day; from age 3 to 4 years, <10 hours/day = 0, 10 to <11 hours/day = 1, and ≥11 hours/day = 2; at age 5 to 7 years, <9 hours/day = 0, 9 to <10 hours/day = 1, and ≥10 hours/day = 2. The range of the total score was 0 to 13, where 0 indicated the maximal sleep curtailment and 13 indicated never having curtailed sleep.

    As a secondary exposure we also examined sleep curtailment at each age separately but collapsed into 3 age periods, age 6 months to 2 years, 3 to 4 years, and 5 to 7 years, based on comparable results and ease of interpretation. We defined curtailed sleep as <12 hours/day from age 6 months to 2 years, <10 hours/day from age 3 to 4 years, and <9 hours/day from age 5 to 7 years.

    Outcome Measures

    At age 7 years, we measured height and weight of children using a calibrated stadiometer (Shorr Productions, Olney, MD) and scale (Seca model 881, Seca Corp, Hanover, MD). We calculated age- and gender-specific BMI z scores by using US national reference data. 30 We defined obesity as a BMI for age and gender ≥95th percentile. 30 We also measured total and trunk fat using dual-energy radiograph absorptiometry and calculated fat mass index (FMI, kg/m2), waist circumference (cm) and hip circumference (cm) using a Lefkin woven tape, and subscapular and triceps skinfold thicknesses (SS+TR) using Holtain calipers (Holtain LTD, Crosswell, United Kingdom), and calculated the sum (SS+TR) of the 2 thicknesses. Research assistants performing all measurements followed standardized techniques, 31 and participated in in-service training to ensure measurement validity. 32

    Other Measures

    At enrollment, we collected information about maternal age, education, parity, household income, and child’s race and ethnicity. In mid-childhood, we asked parents to report the number of hours their children watched television/videos on an average weekday and weekend day in the past month. Response categories included, “none, <1 hour a day, 1–3 hours a day, 4–6 hours a day, 7–9 hours a day, and 10 or more hours a day.” Mothers also reported their pre-pregnancy weight and height, from which we calculated their BMIs.

    Statistical Analysis

    We first examined bivariate relationships of child’s sleep score and curtailed sleep with each covariate and with our anthropometric outcomes. We then used multivariable linear or logistic regression models to examine the associations of child’s sleep score and curtailed sleep with our anthropometric outcomes with and without the inclusion of potential confounders. Our first model, Model 1, was adjusted for child age and gender only. We then additionally adjusted the multivariable models for potential confounders including sociodemographic variables and maternal BMI (Model 2) and child television viewing at mid-childhood (Model 3).

    To examine the independent effects of curtailed sleep in each age period on the anthropometric outcomes, we ran separate multivariable models with each age period (Table 3). We then also adjusted curtailed sleep in the later age periods for curtailed sleep in earlier age periods by adding curtailment variables at earlier ages as additional covariates (Fig 2). The models of curtailed sleep from age 3 to 4 years were adjusted for curtailed sleep from age 6 months to 2 years; models of curtailed sleep from age 5 to 7 years were adjusted for curtailed sleep from age 6 months to 2 years and 3 to 4 years.

    The confounding variables in our analyses were not available for all subjects. We therefore used multiple imputation to generate several plausible values for each missing value. 33 , 34 We used a chained equations approach with predictive mean matching based on linear regressions for approximately continuous variables and logistic or generalized logistic regression for dichotomous or more generally categorical variables. The “completed” data set comprises the observed data and 1 imputed value for each missing value. We replicated this analysis across completed data sets and then combined them in a structured fashion that accurately reflects the true amount of information in the observed data (ie, without erroneously presuming that the imputed values are known true values) but recovering the information in partially observed subjects. We generated 50 complete data sets 35 and combined multivariable modeling results (Proc MI ANALYZE) in SAS version 9.3 (SAS Institute, Cary, NC).

    From these multiple imputation results, we report adjusted effect estimates or odds ratios (OR) from regressions and 95% confidence intervals (CI) for each sleep category with the lowest risk sleep category as the reference group.

    Results

    Characteristics of study participants overall, and by sleep score, are shown in Table 1. Children who lived in homes with lower household incomes and lower maternal educational attainment were more likely to have lower sleep scores indicating more sleep curtailment from age 6 months to 7 years (Table 1). In addition, black, Hispanic, and other race/ethnicity children were more likely than white children to have curtailed sleep (Table 1). In mid-childhood, curtailed sleep was also associated with greater hours of television viewing (Table 1). In bivariate analyses (Table 1), children who had the lowest sleep score (most curtailed sleep) had higher indices of all of our anthropometric outcomes.

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    TABLE 1

    Characteristics of 1046 Children From Project Viva, Overall, and by Sleep Curtailment Score

    The mean (SD; range) total sleep score from age 6 months to 7 years was 10.2 (2.7; 0–13). The score frequencies are shown in Table 1. We collapsed scores of 0 to 4, 5 to 7, and 8 to 9 because of small frequencies and also of 10 to 11 and 12 to 13 because of comparable results. In multivariable models, adjusted for child’s age, gender, race/ethnicity, and television viewing; maternal age, education, pre-pregnancy BMI, and parity; and household income, children who had lower sleep scores had higher anthropometric indices (Table 2, Model 3 and Fig 1). For example, children who had a score of 0 to 4 compared with a score of 12 to 13 had higher BMI z score (0.48 U; 95% CI, 0.13 to 0.83), sum of subscapular and triceps skinfold thickness (4.22 mm; 95% CI, 0.72 to 7.72), total FMI (0.72 kg/m2; 95% CI, 0.02 to 1.42), trunk FMI (0.36 kg/m2; 95% CI, 0.05 to 0.67), waist circumference (3.61 cm; 95% CI, 0.74 to 6.48), hip circumference (2.78 mm; 95% CI, 0.23 to 5.32), and a higher odds of obesity (OR, 2.62; 95% CI, 0.99 to 6.97). Furthermore, BMI z score was 0.05 U (95% CI, −0.07 to −0.02) less for each additional increment in the sleep score.

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    TABLE 2

    Multivariable Associations of the Sleep Curtailment Score With Anthropometric Outcomes at Mid-Childhood

    FIGURE 1
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    FIGURE 1

    Multivariable adjusted associations of the sleep curtailment score with BMI z score at mid-childhood. The range of the total sleep score is 0 to 13, where 0 indicates the maximal sleep curtailment and 13 indicates never having curtailed sleep. Models are adjusted for maternal age, education, BMI, and parity; household income; child race/ethnicity; and child television-viewing at mid-childhood.

    In multivariable analyses, we found that across all 3 age periods, children who had the most curtailed sleep had higher anthropometric indices. For example, children who had curtailed sleep from age 6 months to 2 years had a BMI z score that was 0.15 U (95% CI, 0.02 to 0.28) higher than the referent group (Table 3, Model 3). Similarly, from age 3 to 4 years and from age 5 to 7 years, children who had curtailed sleep had a higher BMI z score than the referent group (Table 3). We observed a similar trend of curtailed sleep across all age periods with overall higher anthropometric outcomes, although CIs in some cases spanned 0.

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    TABLE 3

    Multivariable Associations of Sleep Curtailment at Each Age Period With Anthropometric Outcomes at Mid-Childhood

    In multivariable models in which we additionally adjusted sleep curtailment in later age periods for sleep curtailment in the younger age periods (Fig 2), we observed fairly similar effect estimates for BMI z score among those who had curtailed sleep across all age periods.

    FIGURE 2
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    FIGURE 2

    Multivariable adjusted associations of sleep curtailment at each age period with BMI z score at mid-childhood. Models of curtailed sleep in the later age periods are adjusted for curtailed sleep in earlier age periods. The models of curtailed sleep from age 3 to 4 years were adjusted for sleep duration from age 6 months to 2 years; models of curtailed sleep from age 5 to 7 years were adjusted for curtailed sleep from age 6 months to 2 years and 3 to 4 years, as well as for maternal age, education, BMI, and parity; household income; and child race/ethnicity.

    Discussion

    In this prospective cohort, chronic sleep curtailment throughout infancy to mid-childhood was associated with higher overall and central adiposity at age 7 years. The adverse effects of sleep curtailment on adiposity were consistent across infancy, early-, and mid-childhood, and we did not find evidence for a particular critical period. The associations between curtailed sleep and overall and central adiposity persisted even after adjustment for many potential confounders of the relationship between sleep and adiposity.

    We first examined the association between chronic sleep curtailment and our BMI and adiposity outcomes. A 0 to 4 value on our chronic curtailment score indicated multiple times from age 6 months to 7 years during which sleep duration was suboptimal based on published associations with obesity or age-specific recommendations. Previous studies, such as that by Landhuis et al, 26 have used repeated sleep measures to relate lower average sleep duration during ages 5 to 11 years with higher odds of obesity at age 32 years. Another study 36 used repeated measures of time in bed from ages 10 to 13 years to create 3 time-in-bed trajectories: short sleepers, 10.5-hour sleepers, and 11-hour sleepers. Seegers et al 36 found that the short-sleeper trajectory was associated with a higher OR for being overweight (OR, 1.99; 95% CI, 1.67 to 2.37) and obese (OR, 2.23; 95% CI, 2.18 to 2.27) at 13 years of age compared with the 11-hour sleeper trajectory. Using our sleep curtailment score, we found that children who had more sleep curtailment from age 6 months to 7 years with observed thresholds between 0 to 4 had higher anthropometric indices. Given similar directional associations of all of the anthropometric outcomes with sleep curtailment, recent studies that show high correlation between several anthropometric indices, 37 and comparable clinical significance for a range of metabolic risk factors, 38 , 39 our study might suggest that in epidemiologic studies of school-aged children in which dual-energy radiograph absorptiometry is not available or is cost-prohibitive, more feasible anthropometric measures such as BMI and skinfold thicknesses are reasonable surrogate measures.

    Previous studies have suggested infancy and early childhood as critical periods for development of associations between sleep and obesity. 40 In a study of children birth to 13 years of age, 40 shorter duration of nighttime sleep from birth to age 4 years, but not from age 5 to 13 years, was associated with subsequent risk for overweight and obesity (OR, 1.80; 95% CI, 1.16 to 2.80). The authors concluded that there is a critical window before age 5 years when nighttime sleep may be important for subsequent obesity status. In contrast to this study, we did not find evidence of a critical period of sleep curtailment. Instead we found that across infancy, early-, and mid-childhood, curtailed sleep was consistently associated with adverse anthropometric outcomes. Our findings suggest that sleep curtailment across childhood appears to be a developmentally important risk factor for increased adiposity.

    Among adults and more recently among children and adolescents, several mechanisms have been proposed relating curtailed sleep and obesity, including indirect influence on diet through neurohormonal controls of hunger and satiation 41 as well as direct influences on sympathetic activity, elevation of cortisol and ghrelin levels, decreases in leptin levels, and/or impairing glucose tolerance. 42 – 46 Other studies suggest that circadian misalignment can contribute to metabolic dysfunction and adiposity. 47 Molecular circadian clocks exist in almost all tissues and contribute to the coordination of gene transcription involved in a range of metabolic processes. 48 Studies show that central and peripheral circadian molecular clocks interact to achieve appropriate internal alignment of metabolic signaling as well as external alignment of cellular processes with the environment. It is also possible that common genetic pathways may underlie associations of sleep, obesity, and metabolic dysfunction. Emerging evidence from genetic studies in animals shows links between circadian “clock” genes, sleep, and metabolic systems. 49 For example, a loss of function mutation in the Circadian Locomotor Output Cycles Kaput (CLOCK) gene, the first mammalian circadian gene identified, 50 – 52 has been shown to alter circadian rhythmicity, 50 , 53 sleep architecture, and homeostasis, 54 and to result in hyperphagia, obesity, and metabolic dysfunction in mice. 55

    In early childhood, insufficient sleep might be a consequence of parental behaviors at bedtime and during the night 56 or household routines that might also increase risk for childhood obesity. Anderson et al 57 have found that among US preschool-aged children, exposure to 3 household routines (eg, regularly eating the evening meal as a family, obtaining adequate nighttime sleep, and having limited screen-viewing time) was associated with an approximately 40% lower prevalence of obesity than those exposed to none of these routines. Another potential mechanism that could explain our observed associations is the relationship between sleep duration, television viewing, and other screen-based technologies. Television viewing is a known risk factor for childhood obesity and is associated with short sleep duration. For these reasons, in the current study we adjusted for television viewing, which confounded the relationship between sleep and the adiposity, but sleep was still independently associated with our anthropometric outcomes. Other screen-based technologies such as computers, mobile telephones, and video gaming could also be associated with curtailed sleep and might be upstream or in the intermediate pathway in the relationship between sleep and obesity. 58

    Our study had several strengths. First, we collected longitudinal data on sleep duration beginning in early infancy through 7 years of age and used repeated measures of sleep to examine chronic sleep curtailment. Second, we analyzed several measures of adiposity in children, including skinfolds, FMIs, and circumferences as well as BMI from heights and weights. Most previous studies used BMI as the only outcome. Our study also had limitations. In this cohort, 38.9% of infants age 6 months to 2 years were defined as having sleep curtailment based on a cutoff of 12 hours of sleep. Although previous studies have also demonstrated a high prevalence of short sleep in infancy, 59 the cutoff of 12 hours may overestimate the number of children who are categorized as insufficient. We used the best available empirical evidence to define thresholds of sleep curtailment but because of biological variation and lack of mechanistic data, these cutoffs may not be appropriate across large populations. Maternal education and household income levels were relatively high, and we had underrepresentation of Hispanics in this cohort culled from eastern Massachusetts. Our results may not be generalizable to more socioeconomically disadvantaged populations, Hispanics, or to populations outside of Massachusetts. Second, in any observational study it is possible that unmeasured characteristics (eg, co-sleeping, bedroom sharing, and sleep routines) might explain the observed associations between exposure and outcome. Finally, we measured sleep duration by mother’s report on the questionnaires as opposed to using an objective measure of sleep such as accelerometers or diaries. However, the potential misclassification of sleep duration is likely non-differential with respect to obesity and any resulting bias should be toward the null.

    Conclusions

    Sleep curtailment from infancy to school age was associated with higher overall and central adiposity in mid-childhood. Improving sleep could be an achievable intervention for attenuating obesity risk.

    Acknowledgments

    We thank the participants and staff of the Project Viva study.

    Footnotes

      • Accepted March 21, 2014.
    • Address correspondence to Elsie M. Taveras, MD, MPH, Division of General Academic Pediatrics, Department of Pediatrics, Massachusetts General Hospital, 100 Cambridge St, 15th Floor, Boston, MA 02114. E-mail: etaveras{at}partners.org
    • Dr Taveras conceptualized and designed the study, obtained funding, and drafted the initial manuscript; Dr Gillman assisted with the conceptualization and design of the study, helped obtain funding, and reviewed and revised the manuscript; Dr Redline assisted with the conceptualization and design of the study, helped obtain funding, and reviewed and revised the manuscript; Ms Peña assisted with the conceptualization of the study exposure definitions and reviewed and revised the manuscript; Ms Shiman carried out the initial analyses and reviewed and revised the manuscript; and all authors approved the final manuscript as submitted.

    • FINANCIAL DISCLOSURE: The authors have indicated they have no financial relationships relevant to this article to disclose.

    • FUNDING: This work was supported by the National Cancer Institute’s Centers for Transdisciplinary Research on Energetics and Cancer (TREC) (U54CA116847) and the Eunice Kennedy Shriver National Institute of Child Health and Human Development (R37HD034568). The opinions or assertions contained herein are the private ones of the authors and are not considered as official or reflecting the views of the National Institutes of Health. Funded by the National Institutes of Health (NIH).

    • POTENTIAL CONFLICT OF INTEREST: The authors have indicated they have no potential conflicts of interest to disclose.

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    Chronic Sleep Curtailment and Adiposity
    Elsie M. Taveras, Matthew W. Gillman, Michelle-Marie Peña, Susan Redline, Sheryl L. Rifas-Shiman
    Pediatrics Jun 2014, 133 (6) 1013-1022; DOI: 10.1542/peds.2013-3065

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    Chronic Sleep Curtailment and Adiposity
    Elsie M. Taveras, Matthew W. Gillman, Michelle-Marie Peña, Susan Redline, Sheryl L. Rifas-Shiman
    Pediatrics Jun 2014, 133 (6) 1013-1022; DOI: 10.1542/peds.2013-3065
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