Study finds that delayed bed times are associated with increases in BMI, suggesting that getting enough sleep could be a weight management strategy.


A study conducted by researchers from the University of California, in collaboration with researchers from Columbia University, New York has investigated whether bed times can have long term effects on body mass index (BMI).

The study used data derived from the Nati­onal Longitudinal Study of Adolescent Health to determine the bed times and BMI measurements of over 3 000 adolescents, which was followed over a 15-year period.

The study reported an increase in BMI over time that was associated with later bedtimes during the working week that spanned from adolescence to adulthood. This was calculated as a BMI increase of 0.035kg/m2 per minute later bedtime per 6 years.

The study provides evidence that delayed bedtime over a long period of time can have effects on weight, providing a potential target to prevent weight gain in the years spanning from adolescence to adulthood. This may be an important target in the fight against the rising rates of obesity.


Asarnow, LD, McGlinchey, E, Harvey, AG “POSSIBLE LINK BETWEEN BEDTIME AND CHANGE IN BODY MASS INDEX Evidence for a Possible Link between Bedtime and Change in Body Mass Index” Sleep Volume 38, Issue 10, 2015.







Written by Deborah Tallarigo, PhD

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