Table 1.

Sleep architecture data

Characteristic
Sleep-onset latency (min)	17 ± 7
Total sleep time (min)	233 ± 12
Sleep efficiency (%)	68 ± 4
Stage 1 (% total sleep time)	15 ± 3
Stage 2 (%total sleep time)	52 ± 3
SWS (%total sleep time)	29 ± 4
REM (%total sleep time)	5 ± 1
Arousal Index (arousals h−1)	24 ± 3

Slow wave sleep (SWS), rapid eye movement sleep (REM). Values are means ± s.e.m. (n = 17 subjects).