Table 3. Melatonin profile characteristics and sleep times.

	Mean (SD)	Range
Peak value (pg/ml)	17.64 (12.48)	2.40 to 83.60
Area under the curve (pg/ml/0.5 h)	235.68 (155.73)	43.95 to 1063.29
DLMO (time)	20:50 (1:12)	18:13 to 00:26
DLMOff (time)	08:21 (1:25)	04:54 to 12:38
DLMO to DLMOff (h)	11.52 (1.25)	7.89 to 14.70
DLMO to bedtime (h)	2.65 (1.04)	−0.30 to 5.79
Sunset to DLMO (h)	1.59 (1.68)	−1.44 to 6.92
Prestudy bedtime	00:10 (0:55)	22:02 to 03:02
Prestudy wake time	08:11 (1:01)	05:43 to 12:04
Prestudy time in dark (h)	8.01 (0.76)	6.22 to 12.88
Assigned bedtime	23:28 (0:47)	22:00 to 02:00
Assigned wake time	07:31 (0:48)	06:00 to 10:00
Assigned time in dark (h)	8.05 (0.20)	8.00 to 9.00