Table 1: Mean ± SEM and median concentrations of leptin and ghrelin. Exposure to red light significantly ( 𝑃 < 0 . 0 5 ) increased leptin concentrations compared to the remaining in dim-light condition after both 8-hour sleep and 5-hour sleep schedules.

LeptinGhrelin
Mean ± SEM (ng/mL)Median (ng/mL)Mean ± SEM (pg/mL)Median (ng/mL)

8-hour sleep/dim9.7 ± 2.37.9979 ± 87945
5-hour sleep/dim9.5 ± 2.66.2983 ± 70957
5-hour sleep/green11.6 ± 2.78.4894 ± 43847
5-hour sleep/blue11.5 ± 2.69.1962 ± 88884
5-hour sleep/red12.0 ± 2.7*9.8906 ± 90768

* 𝑃 = 0 . 0 5 .