“You just need a good night's sleep.”
Your roommate had a really bad day and she's upset. You think that she should go to sleep, and she'll feel better tomorrow. You give her this advice.
You just need a good night's sleep.
Talk about something that's not very important, not interesting, not a big problem, or not hard with the word "just". For example:
It's just a short trip. I won't be gone for long.
This is just a temporary job for me.
The phrase "a good night's sleep" describes sleeping peacefully throughout the night. After a "good night's sleep" you will probably wake up feeling rested and refreshed.
The best way to prepare for a big exam is to get a good night's sleep the night before.
People also use this phrase when they complain:
I haven't had a good night's sleep in weeks!
Use the expression "You just need ___" when you want to comfort someone who's having a problem of some kind. For example, if someone feels sick you can offer to cook for them:
You just need a good, home-cooked meal.