Table 4.

Summary of results

(vs subjectively sleepy controls)	NT1	NT2	IH
TST			Longer sleep	ANOVA
SE	Increased	Increased	*Increased	ANOVA
Percentage of stage (full PSG night)	Increased N1, decreased N2	Increased REM	Decreased N3 sleep; trend for increased N2 sleep	ANOVA
REM sleep onset latency	Shorter	Shorter
Arousal index	Increased			ANOVA
Median bout duration (in first 8 hours of PSG recording)	Longer N1 bouts, shorter REM bouts	Longer N1 bouts	Shorter NREM 3 bouts	Mood’s Median Test
Survival curves of full PSG recording)	Decreased survival of wake, N2 and REM bouts	Increased survival of N1 bouts	Increased survival of N2 bouts; less stable N3 bouts for older IH only	Cox proportional hazards model
Number of bouts (in first 8 hours of PSG recording)	More W, N1, N2, and REM bouts			Linear model

*The IH group showed increased sleep efficiency compared to subjectively sleepy controls but not after the outlier with TST more than 19 hours was excluded.