在《内经》营卫睡眠理论的基础上，后世医家提出了阴阳睡眠理论与阳不交阴则不寐的学说；
Thirdly , on the base of the theory which explaining sleep with Ying-wei 's movement , some successive doctors bring forward the theory which explaining sleep with Yin-Yang , and think the reason for insomnia is Yang fails in associating with Yin ;
阳交