Table 1.

Sleep data (means and ± SD) in habitual and extended sleep across 7 nights

	Habitual Short Sleep	Extended Sleep	P value
TST (h)	5.7 ± 0.5	7.4 ± 0.6	P < 0.002
SE (%)	92.9 ± 4.2	90.3 ± 5	n.s.
LPS (min)	9.6 ± 5.6	19.2 ± 13.0	P < 0.04
Stage 1 and 2 sleep (min)	203.6 ± 35.0	271 ± 37.1	P < 0.003
SWS (min)	48.5 ± 22.0	52.6 ± 20.0	n.s.
REM (min)	90.0 ± 22.0	120.2 ± 34.0	n.s.
WTDS (min)	7.3 ± 7.0	18.8 ± 10.0	P < 0.01

TST, total sleep time; SE, sleep efficiency; LPS, latency to persistent sleep; SWS, slow wave sleep; WTDS, wake time during sleep; n.s., P > 0.05.