Table 2.

Sleep measures for the DS and TD groups. Average sleep efficiency (percent of time spent asleep from sleep onset to offset), average sleep time (time spent asleep minus any periods of wake), average wake after sleep onset (time spent awake), average wake percentage (percent of time spent wake from sleep onset to offset), and average sleep fragmentation (an index of restlessness based on the sum of mobile time and immobile time that last less than a minute during the night). Averages were taken across all nights of sleep collected.

	DS group			TD group
	n	M	SD	n	M	SD
Average Sleep Efficiency	22	82.82	10.16	22	87.51	3.85
Average Sleep Time	22	422.96	95.41	22	482.04	41.58
Average Wake After Sleep Onset	22	67.08	35.62	22	60.26	17.26
Average Wake Percentage	22	13.93	6.86	22	10.98	2.73
Average Sleep Fragmentation	22	28.14	9.03	22	25.04	5.57