Table 3.

Nocturnal sleep indicators of users completing Step 1 (n=166).

Sleep indicator	Value, mean (SD)		t test (df)	P value
	First 2 nights (1 & 2)	Last 2 nights (6 & 7)
Time in bed, hh:mm:ss	08:56:45 (01:34:22)	08:40:27 (01:29:27)	2.17 (165)a	.03
Total sleep time, hh:mm:ss	06:04:32 (01:56:47)	06:21:30 (01:37:33)	−1.88 (165)	.06
Sleep efficiency, %	67.60 (20.25)	73.82 (17.33)	−4.25 (165)	.001
Sleep onset latency, hh:mm:ss	01:31:38 (02:39:11)	00:58:37 (01:26.00)	2.78 (165)	.006
Nocturnal awakenings, n	1.89 (1.57)	1.67 (1.32)	1.81 (165)	.07
Wake after initial sleep onset, hh:mm:ss	00:48:57 (00:55:48)	00:42:01 (00:52:58)	1.27 (165)	.21
Terminal wakefulness, hh:mm:ss	00:58:11 (01:09:42)	00:39:43 (0:39:57)	3.31 (165)	.001

^aItalicized values indicate they are statistically significant.