Is it good night sleep or good night’s sleep?
It is good night’s sleep, not good night sleep. The expression “good night’s sleep” has an apostrophe + “s” because “night” is a possessive noun in this context.
For example, when you’re writing good night wishes, you might use “I hope you have a good night’s sleep.”
When you’re writing with expressions like “good night’s sleep,” QuillBot’s free Grammar Checker will instantly show you the correct spelling and punctuation.