例句：
I sleep with the window open unless it's really cold.
天氣若不很冷，我總開著窗戶睡覺。
He works at night and sleeps during the day.
他晚上干活，白天睡覺。
How long can a human being go without sleep?
人不睡覺能活多久？
He took a long time getting to sleep that night.
他那天晚上過了好長(zhǎng)時(shí)間才睡著。
You'll feel better for a good night's sleep.
你晚上睡個(gè)好覺就會(huì)覺得好些。