Table 2.

Comparison of polysomnographic features in SCA1, 2 and 3

	SCA1	SCA2	SCA3
Total sleep duration, h	7.8±0.8	7.6±0.5	7.7±0.4
Sleep efficiency	75.4±12.8	79.7±15.9	68.1±25.3
N1 percent	25.2±12.1	15.4±13.3	21±13.6
N2 percent	42.9±13.1	61.1±9.7	46.1±20.1
N3 percent	21.5±10.6	21.1±11.3	27.6±17.3
REM percent	10.4±7.0	0.4±0.9	8.3±12.1
N1 latency, min	24.8±21.3	17.1±11.2	9±7.4
N2 latency, min	37.6±17.5	23.9±14.5	16.6±10.8

Values are mean ± SD.

SCA, spinocerebellar ataxia; N1, N2, N3, stages of non rapid eye movement sleep; REM, rapid eye movement sleep.