Did you sleep well?

谢谢，Min for teaching me this new vocabulary.

早上好

你睡的好吗?

你 ni3 You
睡 shui4 sleep
的 de
好 hao well
吗 ma5

if you want to express the time，you can add last night.
昨晚

昨 zuo 2
晚 wan 3

你昨晚睡的好吗。