Table 4.

Nap sleep-stage time (min) and percentage in the nap group (mean ± SEM)

	Sleep time (min)	Percentage
Total nap time	83.27 ± 4.18
Sleep latency	10.92 ± 6.07
REM latency	59.80 ± 4.76
Stage 1	11.06 ± 3.21	12.56 ± 4.69
Stage 2	18.18 ± 2.55	21.77 ± 3.03
Stage 3	14.33 ± 1.92	17.42 ± 2.85
Stage 4	29.45 ± 3.25	36.53 ± 4.41
SWS	43.78 ± 4.31	53.95 ± 6.24
REM	10.24 ± 1.77	11.72 ± 1.99