方法：以翻正反射消失为睡眠开始的指标，至翻正反射恢复作为睡眠时间。

Methods: the absence of the righting reflex was considered as the sleep onset and the duration of the loss of the righting reflex was recorded as the sleeping time.

youdao

方法：以翻正反射消失为睡眠开始的指标，至翻正反射恢复作为睡眠时间。

Methods: the absence of the righting reflex was considered as the sleep onset and the duration of the loss of the righting reflex was recorded as the sleeping time.

youdao