Table 2. Sleep structure (n = 20);

Variable	Mean ± SD
Total sleep time, min	150.1 ± 46.1
N1 sleep, %	18.0 ± 10.4
N2 sleep, %	57.2 ± 15.1
N3 sleep, %	11.5 ± 12.9
REM sleep, %	10.7 ± 8.1
Sleep efficiency, %	74.7 ± 15.0
Total AHI, /h	27.6 ± 25.8
Obstructive AHI, /h	25.5 ± 25.7
Central AHI, /h	2.0 ± 2.67