Table 4.

Sleep problems of children with ASD, delayed or typical development (cont.)^*

	ASD (n=303)		DD (n=63)		TD (n=163)
	n	%	n	%	n	%	P value
Summarized sleep patterns
Any frequent sleep problems	159	52.5	29	46.0	52	31.9	<.0001
Any frequent sleep onset problems	155	51.2	29	46.0	52	31.9	.0003
Any frequent night waking problems	30	9.9	2	3.2	3	1.8	.0007
Does sleep problem affect child’s daily functioning	61	20.7	12	19.7	2	1.2	<.0001
Does sleep problem affect family’s daily functioning	69	23.1	13	21.3	4	2.5	<.0001
Factor 1. Sleep onset problems
Has trouble falling asleep	74	24.4	12	19.0	14	8.6	<.0001
Goes to bed at different times	67	22.1	20	31.7	21	12.9	.0035
Resists going to bed at night	66	21.8	10	15.9	26	15.9	.23
Sleeps better in places other than his/her bed	53	17.5	11	17.5	14	8.6	.02
Sleeps less than children his/her own age	46	15.2	6	9.5	8	4.9	.0018
Throws tantrums at bedtime	30	9.9	6	9.5	5	3.1	.01
Gets less than 6 hours sleep in a 24 hour period	7	2.3	1	1.6	0	0.0	<.05
Factor 2. Night waking
Wakes up screaming during the night	20	6.6	1	1.6	1	0.6	.0014
Screams during the second half of the night	19	6.3	1	1.6	1	0.6	.0022
Has nightmares	13	4.3	1	1.6	1	0.6	.03
Wakes up screaming approximately 2 hours after going to sleep	8	2.6	1	1.6	3	1.8	.79

^*Data are given as percentage of each group unless otherwise indicated. Numbers may not add up to total due to sporadic missing data. Percentages may not total 100 because of rounding. P-values were calculated using likelihood ratio Chi-square test.