You'd better sleep at 10: 00- 10: 30 at night.
Because from the afternoon of 12 to 3 o'clock, it is a deep sleep period.
As long as you sleep well for three hours, you will feel refreshed all day.
It usually takes 30-60 minutes from falling asleep to entering deep sleep.
So you'd better sleep at 10: 00- 10: 30 at night.