How many hours do you sleep every day I sleep 6 or more hours everyday, I know it is not enough, but as a salaried worker, there is no point for me to go to bed early due to working OT frequently. Apparently, sleeping enough is very significant for our health. If we have no plenty of sleep, our energy can not be recovered from a day long working and we would feel exhausted, which would lead to a bad result that we could not perform well in the office or in the study. I used to taking a nap in the midday, it is very crucial moment for me. If I have no time to nap, I definitely will exhaust soon at the afternoon and I have to drink a lot to coffee to make me be awake. Generally speaking, old people sleep less than young people. Although they go to bed early at night, they get up much early in the morning. InChina, in the very early morning, if you go to park or go to some restaurant where provide morning tea service , there are a lot of old people, most of them get up earlier than 4am. According to scientific research, staying up late is surely a negative thing, which probably damage our health and deteriorate our body. Taking myself as an example, if I worked OT in last night, today my brain's reaction speed is slower and I will lose interestings to do anything.