Just because someone stays up till 3AM (which I have done for years), doesn't mean they need to sleep less or feel always tired. This has nothing to do with usi

Just because someone stays up till 3AM (which I have done for years), doesn't mean they need to sleep less or feel always tired. This has nothing to do with using computer in dark room which is possible even at 3PM. Also, I don't drink coffee (less than 5 times a year). There are plenty of people who sleep at proper time and still drink a lot of coffee all day.