Table 3.

Sleep characteristics (mean (SEM))

	TST (min)	SE (%)	RL (min)	NREM1 (%)	NREM2 (%)	SWS (%)	REM (%)
OA 1	436.56 (8.41)	93.51 (1.01)	96.17 (11.41)	9.25 (0.76)	53.13 (1.37)	17.10 (0.94)	20.54 (1.34)
YA 1	420.23 (13.21)	92.84 (1.24)	104.48 (10.57)	10.97 (1.30)	44.63 (1.90)	19.49 (0.95)	24.91 (1.82)
OA 2	400.13 (16.74)	91.60 (2.04)	83.50 (12.67)	6.96 (0.75)	53.29 (1.59)	17.48 (1.45)	22.44 (1.58)
YA 2	407.23 (17.79)	94.67 (1.24)	106.39 (10.79)	4.88 (1.13)	52.19 (1.25)	23.89 (1.44)	19.04 (1.70)
p 1	0.312	0.683	0.595	0.266	0.001*	0.080	0.061
p 2	0.061	0.407	0.461	0.037*	0.939	0.826	0.363
p 3	0.552	0.316	0.901	0.001*	0.003*	0.012*	0.026*
p 4	0.774	0.237	0.187	0.122	0.600	0.003*	0.151

OA 1=older adults in experiment 1, OA 2=older adults in experiment 2, YA 1 =young adults in experiment 1, YA 2 = young adults in experiment 2, TST=total sleep time, SE=sleep efficiency, RL=REM latency, p 1=p-value when comparing OA 1 and YA 1, p 2=p-value when comparing OA 1 and OA 2, p 3=p-value when comparing YA 1 and YA 2, p 4=p-value when comparing OA 2 and YA 2,

^*denotes statistical significance