Because most people are asleep during these hours, melatonin peaks when you sleep. Which for most people is 22:00 - 7:00 or something. Your circadian rhythm re

Because most people are asleep during these hours, melatonin peaks when you sleep. Which for most people is 22:00 - 7:00 or something. Your circadian rhythm regulates melatonin release. Not the clock hanging on your wall. From your other comment, seems like your problem is a very inconsistent sleep pattern and not enough sleep.