表 1. Average epochs of each sleep period in the depression group and the normal control group.

抑郁症与正常对照组睡眠期平均帧数

Group	n	W	N1	N2	N3	REM
W: wake stage; N1: non-rapid eye movement sleep stage 1; N2: non-rapid eye movement sleep stage 2; N3: non-rapid eye movement sleep stage 3; REM: rapid eye movement sleep.
Depression	28	252	58	540	60	89
Control	37	169	105	390	158	123