Why we should sleep only in night?

Before going to discuss about other disease, I feel its

better to discuss about sleep. Because sleep plays very important role in

health. Actually many say that sleep is a double edged sward! If you sleep more

that is a problem, if you sleep less that is another problem. And many want to

know what normal sleep time is. Many health advisors say it is 6 to 8 hours. So

sleeping less than 6 hours or more than 8 hours is wrong? I say NO read more on

https://www.phaforum.org/single-post/2017/04/05/Why-we-should-sleep-only-in-nights