Table 1.

Sleep variables derived from rest-activity recordings.

Month	1 (April)	2 (May)	3 (June)	4 (July)	5 (Aug)	6 (Sep)	7 (Oct)
Bed Time*	0:41	1:07	1:42	1:10	1:11	1:17	1:09
(SD)	(2:07)	(1:41)	(1:53)	(1:42)	(1:33)	(1:34)	(1:40)
Wake Time*	8:25	8:51	9:15	8:50	8:53	9:02	9:12
(SD)	(1:49)	(1:32)	(1:49)	(1:35)	(1:28)	(1:29)	(1:46)
Time in Bed*	7:47	7:43	7:33	7:40	7:42	7:45	8:02
(SD)	(1:32)	(1:37)	(1:36)	(1:34)	(1:29)	(1:34)	(1:38)
Sleep Start*	0:44	1:14	1:48	1:16	1:17	1:24	1:16
(SD)	(2:00)	(1:40)	(1:53)	(1:42)	(1:33)	(1:34)	(1:40)
Sleep End*	8:24	8:50	9:15	8:50	8:53	9:01	9:11
(SD)	(1:49)	(1:32)	(1:48)	(1:34)	(1:28)	(1:29)	(1:46)
Sleep Duration*	7:09	7:07	6:57	7:03	7:06	7:08	7:24
(SD)	(1:26)	(1:29)	(1:29)	(1:28)	(1:22)	(1:28)	(1:33)
Sleep Duration (%)	93.38	93.53	93.57	93.45	93.58	93.57	93.53
(SD)	(2.57)	(2.66)	(2.79)	(2.56)	(2.32)	(2.48)	(2.37)
Wake Time	0:30	0:29	0:28	0:29	0:29	0:29	0:30
(SD)	(0:13)	(0:14)	(0:13)	(0:13)	(0:12)	(0:13)	(0:12)
Wake (%)	6.62	6.47	6.43	6.55	6.42	6.43	6.47
(SD)	(2.57)	(2.66)	(2.79)	(2.56)	(2.32)	(2.48)	(2.37)
Sleep Efficiency (%)	91.91	92.09	92.02	91.91	92.07	92.04	92.06
(SD)	(3.26)	(3.17)	(3.27)	(2.90)	(2.70)	(2.93)	(2.75)
Sleep Bouts (#)	20.25	19.35	18.74	19.45	19.08	19.67	19.88
(SD)	(8.58)	(8.85)	(7.92)	(8.08)	(7.17)	(8.08)	(7.92)
Wake Bouts (#)	20.15	19.24	18.63	19.35	18.94	19.49	19.73
(SD)	(8.58	(8.87)	(7.87)	(8.04)	(7.20)	(8.07)	(7.93)

Sleep variables are averaged for both stations (Standard deviations = SD; in the respective cell below, in brackets) since there was no significant difference between both stations; n = 20. Data is shown as clock time (hours:min) for bed and wake time, sleep start, sleep end, and sleep duration. Wake, sleep efficiency are shown in percentage (%) and sleep and wake bouts are indicated in absolute numbers per night (#). *p-value < 0.05 for significant main effect of TIME (months 1–7). For description of the significant differences between months see text.