I need 8 hours of sleep to maintain, 9 hours to feel very good. If I stay up until 3 or even 5am, my brain does not work for two days (lack of concentration, un

I need 8 hours of sleep to maintain, 9 hours to feel very good. If I stay up until 3 or even 5am, my brain does not work for two days (lack of concentration, unjustified anger,...) - strangely, the second day is worse.