Table 4.

Nocturnal sleep indicators of users completing Step 2 (n=47).

Sleep indicator	Value, mean (SD)		t test (df)	P value
	7 nights before Step 2	7 nights after Step 2
Time in bed, hh:mm:ss	07:56:45 (01:18:51)	08:37:45 (00:50:21)	−5.35 (46)	.001
Total sleep time, hh:mm:ss	06:00:05 (01:24:29)	06:13:26 (01:30:16)	−2.02 (46)	.047
Sleep efficiency, %	68.47 (14.75)	72.36 (16.76)	−3.18 (46)	.002
Sleep onset latency, hh:mm:ss	00:59:22 (00:53:41)	01:08:50 (01:25:02)	−1.01 (46)	.32
Nocturnal awakenings, n	1.77 (1.24)	1.35 (0.97)	5.24 (46)	.001
Wake after initial sleep onset, hh:mm:ss	00:55:26 (00:52:03)	00:35:58 (00:32:57)	3.57 (46)	.001
Terminal wakefulness, hh:mm:ss	00:51:59 (00:42:15)	00:41:17 (00:32:22)	3.04 (46)	.003