Meaning of the word "sleep well" in English

What does "sleep well" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

sleep well

US /sliːp wɛl/
UK /sliːp wɛl/

Phrase

a common farewell or wish for someone to have a good night's sleep

Example:
Goodnight, darling. Sleep well.
I hope you sleep well tonight after such a long day.