Before we go to bed and when we get up in the morning it's common to make small talk about sleeping. Here are the most common phrases used:

Before Going to Bed

Good night.

Sleep well.

Have a good night's sleep.

Make sure to get a good night's sleep.

I hope you sleep well.

See you in the morning

Example Dialogues

Person 1: Good night.

Person 2: See you in the morning.

Person 1: I hope you sleep well.

Person 2: Thank you. Make sure you get a good night's sleep as well.

In the Morning, after Getting Up

I hope you had a good night's sleep.

Did you sleep well?

Did you have a good night's sleep?

I slept well, how about you?

Good morning. Did you sleep well?

How did you sleep?

Example Dialogues

Person 1: Good morning.

Person 2: Good morning. Did you sleep well?

Person 1: I hope you had a good night's sleep.

Person 2: Yes, thank you I did, and you?