Table 1.

Demographic characteristics, mid‐sleep times, and objective sleep measures

Males: N (%)	18 (50)
Age (years)	22.3 ± 1.7
Body mass index	23.4 ± 2.6
MCTQ questionnaire
MSFSC	04:26 ± 0:19
Objective sleep characteristics from actiwatch
Time of falling asleep	00:06 ± 0:24
Number of wakening each night	27.3 ± 6.5
Sleep duration all night	6:44 ± 1:15
Sleep duration on nights before work days	6:26 ± 0:54
Sleep durations on nights before free days	7:03 ± 1:03
Sleep efficiency in %	83 ± 2.4
Sleep latency in minutes	15.6 ± 14.2

Values represent mean ± SEM (n = 36). Abbreviations: MCTQ, Munich Chronotype Questionnaire; MSF_SC, mid‐sleep on free days, corrected for sleep debt on work days.