Table 5.

Participant sleep-wake characteristics in the 24 hours prior to a day, first and final (3^rd/4^th/5^th) night shift calculated from actigraphy with sleep episodes identified by sleep diary entries. Missing actigraphic sleep-wake information has been substituted with data from sleep diaries. There were no sleeps with a duration <15 minutes.

	Mean ± SD		Mean ± SD		Mean ± SD		First vs Final night shift
	Day shift	n	First night shift	n	Final night shift	n	p
Wake time (hh:mm)	5:32 ± 00:40	33	8:23 ± 01:41**	29	16:06 ± 01:32**	32	0.001
TST, all sleeps (h)	5.74 ± 1.17	33	8.19 ± 1.41**	29	6.36 ± 1.18*	32	0.001
Nap (sleep <120 minutes)	0	33	19.79 ± 36.23**	29	20.56 ± 33.05**	32	0.931
Time awake from main sleep# (sleep ≥120 minutes) (h)	2.53 ± 1.31	33	12.74 ± 2.02**	26	5.25 ± 2.12**	28	0.001
Time awake from last sleep# (sleep ≥15 minutes) (h)	2.53 ± 1.31	33	9.76 ± 4.14**	26	4.77 ± 1.86**	28	0.001

*p < 0.05 and **p < 0.005 indicate significant differences from day shift.

^#Indicates time elapsed since main sleep or last sleep prior to the start of a shift.