Table 3. Nap sleep EEG macrostructure given in minutes.

	Mean	Std. Dev.	Minimum	Maximum
Sleep duration	70.39	19.27	21.5	103.5
Wake duration	24.17	19.67	0	70.5
S1 duration	23.18	13.48	1.5	72.0
S2 duration	30.05	14.42	4.0	71.5
SWS duration	11.43	12.07	0	44.0
REM duration	5.73	6.60	0	24.0
Sleep latency (first sleep)	12.24	6.65	4.0	38.5
REM latency (from first sleep)	59.23	22.68	3.5	89.0