How Sleep Length May Relate to Body Fat and Energy Use: A Review of Controlled Trials

Eighteen unique studies were identified examining the effects of sleep duration on body composition, food intake, and related biomarkers.

• Eight studies reported outcomes focused on body weight, with equal representation of increased and reduced sleep.
• Four studies investigated the relationship between sleep duration and food intake.
• Four studies assessed the impact of sleep restriction on total energy expenditure.
• Three studies measured respiratory quotient in relation to sleep duration.
• Four studies examined the hormones leptin and ghrelin in the context of sleep.
• The literature suggests that sleep restriction may increase food intake and total energy expenditure, though effects on overall energy balance are inconsistent.

Simplified