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. 2013 Jul 1;36(7):981–990. doi: 10.5665/sleep.2792

Figure 2.

Figure 2

Caloric intake by day of protocol. (A) Sleep-restricted subjects consumed significantly more calories during days when bedtime was delayed to 04:00 (EW-SR4) compared to days when bedtime was 22:00 (BL, R1-2). Caloric intake did not differ between BL and SR5 (when waking hours were equivalent and bedtime was 22:00). Caloric intake did not differ between BL and each recovery day (R1-2). (B) Sleep-restricted subjects and control subjects did not differ in caloric intake during days when both groups had a 22:00 bedtime (BL, SR5, R1-2). Sleep-restricted subjects consumed more calories than control subjects during days when they had a 04:00 delayed bedtime (EW, SR1-4; d = 0.94). Data expressed as mean ± standard error of the mean. BL, baseline; EW, extended wakefulness; R, recovery; SR, sleep restriction.