Table 4.

Laboratory night measurements for all subjects (mean ± SD, minutes)

Sleep Measure	Actigraphy (N = 59)	PSG (N = 58)	Sleep Diaries (N = 58)
Sleep onset latency	23.3 ± 27.2	27.0 ± 36.0	62.8 ± 57.7
Latency to persistent sleep	N/A	35.1 ± 36.5	N/A
Wake time after sleep onset	59.7 ± 38.8	59.8 ± 51.5	82.6 ± 82.5
Total sleep time	402.5 ± 41.0	389.4 ± 63.1	336.6 ± 104.8
Sleep efficiency	83.2 ± 9.6	81.1 ± 13.1	N/A