If your woken from deep sleep but can go back into a light sleep, you will find it easier to wake from a light sleep.
如果你从深度睡眠中醒来了，但可以重新回到轻度睡眠中，你会发现从轻度睡眠中醒来更容易。
2
This beautiful room is bathed in light. You'll wake up every morning in a good humor.
这个漂亮的房间沐浴着阳光，每天早上醒来时你就会有个好心情。
3
Lack of light may upset your sleep-wake cycle and other circadian rhythms. And it may cause problems with a brain chemical called serotonin that affects mood.