1 Go to bed/sleep. 上床睡觉

已经很晚了，我要去睡觉了。

It's getting late. I am gonna go to bed now.

2 Off to bed. 上床去了

快上床睡觉了，你明天还要早起呢。

Now off to bed. You have to get up early tomorrow morning.

3 Hit the sack/hay 上床睡觉去（俚语）

上床睡觉前记得关电视。

Don't forget to turn off the TV before you hit the sack.

4 Take a nap. 小憩一会儿

我昨晚没睡好，先小睡一会儿。

I didn't sleep well last night. I'm gonna take a nap.

5 Take a snooze 打个盹儿

我爷爷喜欢午饭后打个盹儿。

My grandpa likes to take a snooze after lunch.

6 Catch some Zs 小睡一会儿

你看起来很疲倦，你还是小睡一会儿吧。

You looked tired. You'd better catch some Zs.

7 It's bedtime. 睡觉时间到了

该睡觉咯，晚安各位。

It's bedtime. Goodnight everybody!

8 It's time to say good night. 该道声晚安了

夜深了，该道声晚安了。

It's running late. It's time to say good night.