Table 4.

Proportion of children with rapid eye-movement (REM) sleep in daytime naps and REM sleep variables [mean ± standard deviation (SD)] during morning, afternoon and evening naps at ages 2 years (2 Y), 3 years (3 Y) and 5 years (5 Y).

	Morning nap		Afternoon nap			Evening nap
	2 Y	3 Y	2 Y	3 Y	5 Y	2 Y	3 Y	5 Y
Children with REM sleep (%)	6/8 (75%)	7/8 (88%)	6/8 (75%)	6/8 (75%)	4/5 (80%)	4/7 (57%)	5/8 (63%)	1/5 (20%)
REM sleep latency (min)	39.3 ± 4.8	40.4 ± 11.7	49.7 ± 22.6	49.9 ± 9.9	39.4 ± 17.3	53.5 ± 6.2	45.5 ± 16.5	29.0
REM sleep duration (min)	19.2 ± 8.9	11.9 ± 7.9	21.4 ± 11.6	11.8 ± 5.5	14.5 ± 14.4	13.6 ± 11.3	7.9 ± 5.8	19.0
REM sleep (%)	17.9 ± 7.0	16.3 ± 8.0	17.4 ± 8.1	17.7 ± 9.5	19.5 ± 12.5	16.1 ± 9.3	13.1 ± 9.0	29.9