. Author manuscript; available in PMC: 2016 Jan 31.

Published in final edited form as: Sleep Med. 2014 Dec 18;16(2):288–297. doi: 10.1016/j.sleep.2014.12.004

Table 2.

Mean ± SD actigraphic estimates of sleep onset time, wake time, and total sleep time during baseline (days 1–6 and 8–11) and the 3 treatment days (days 12, 13, and 14) for each bright light group.

	Bright Light Group
	2 h (30 min × 4)	1 h (15 min × 4)	0.5 h (30 min × 1)
Baseline:
Sleep Onset Time	00:16 ± 0:48	00:31 ± 1:03	00:17 ± 1:04
Wake Time	7:55 + 0:43	8:08 ± 1:01	7:54 + 0:59
Total Sleep Time (h)	6.9 ± 0.4	7.0 ± 0.37	7.0 ± 0.2
Treatment Day 1:
Sleep Onset Time	00:10 ± 0:44	23:27 ± 1:05	23:10 ± 1:03^*
Wake Time	6:54 ± 0:45	7:13 ± 1:02	6:54 ± 0:58
Total Sleep Time (h)	6.1 ± 0.5	7.1 ± 0.4^*	7.2 ± 0.4^*
Treatment Day 2:
Sleep Onset Time	22:12 ± 0:45	22:24 ± 1:05	22:13 ± 1:04
Wake Time	5:58 ± 0:46	6:11 ± 1:03	5:48 ± 0:58
Total Sleep Time (h)	7.0 ± 0.5	7.1 ± 0.4	7.0 ± 0.5
Treatment Day 3:
Sleep Onset Time	21:13 ± 0:45	21:29 ± 1:06	21:15 ± 1:04
Wake Time	4:51 ± 0:47	5:11 ± 1:01	4:57 ± 0:58
Total Sleep Time (h)	6.8 ± 0.7	7.1 ± 0.5	7.0 ± 0.3

p<.05 compared to 2 h group.

4 (time) × 3 (bright light group) repeated measures ANOVA:

Sleep Onset Time [time: F(3,141) = 6281.5, p <.001]; [time × group: F(6,141) = 91.0, p <.001]
Wake Time [time: (F(3,141) = 2682.6, p < .001]
Total Sleep Time [time: F(3,141) = 5.0, p = .002]; [time × group: F(6,141) = 17.7, p <.001]