"Did you sleep well last night?"
This is a simple and direct way to ask if someone had a good night's sleep. It's a common question that people might ask each other, especially if they are friends or family members who care about each other's well-being. The phrase "last night" indicates that the person is referring to the previous evening, so it's clear when the conversation takes place. If you want to be more specific, you could say "How was your sleep last night?" This phrase asks for more detail about the quality of the sleep, but it still conveys the same basic idea.
