Table 3.

Polysomnography outcomes at baseline and Week 2 by TIB condition.

			6h TIB (n=41)
Sleep Variable	8h TIB (n=19)		Late Bedtime (n=24)		Early Risetime (n=25)		TIB Condition by Visit p-value§
	Mean	SD	Mean	SD	Mean	SD
Bedtimes (hh:mm)							<.001
Baseline	23:42	1:01	23:42	1:06	23:57	1:02
Week 2	23:48	1:20	1:42	1:06	23:57	1:02
Risetimes (hh:mm)							<.001
Baseline	7:42	1:01	7:42	1:06	7:57	1:03
Week 2	7:42	1:01	7:42	1:06	5:57	1:03
Total sleep time (mins)							<.001
Baseline	430.1	60.9	439.2	36.3	444.0	19.7
Week 2	435.4	25.7	337.8	24.7	332.9	17.0
Sleep efficiency (%)							0.70
Baseline	89.7	12.6	91.7	7.6	92.8	4.0
Week 2	90.8	5.3	93.3	5.0	92.9	4.7
Sleep latency (mins)							0.64
Baseline	25.2	60.2	16.3	32.3	11.5	7.9
Week 2	17.8	22.2	6.8	13.4	8.3	5.2
Number of arousals							0.17
Baseline	19.2	8.2	18.0	10.8	16.8	7.5
Week 2	22.0	9.2	17.0	7.6	14.1	7.0
Stage 1 (%)							0.25
Baseline	5.0	3.0	3.9	3.2	4.5	3.2
Week 2	9.5	6.1	5.1	4.0	7.3	4.8
Stage 2 (%)							0.027
Baseline	53.8	9.5	54.3	8.1	54.2	7.2
Week 2	53.1	8.6	49.5	9.0	57.8	8.6
Slow wave sleep (%)							0.004
Baseline	14.4	9.7	14.6	6.9	12.8	8.0
Week 2	11.6	7.1	20.3	12.1	12.8	7.7
REM sleep (%)							0.08
Baseline	22.1	7.6	23.5	4.7	25.0	6.1
Week 2	20.4	5.3	21.0	5.6	18.0	6.1
REM latency (mins)							0.52
Baseline	98.4	42.5	78.1	33.0	70.3	21.1
Week 2	130.0	55.8	132.2	61.4	121.1	49.9

^§TIB Condition includes all three levels (8h TIB, Late Bedtime, Early Risetime)

Note: boldface type denotes significant findings

Abbreviations

mins = minutes

REM = Rapid eye movement sleep

6h TIB = 6 hours time in bed

8h TIB = 8 hours time in bed