8 hour sleep

Do we really need to sleep 8 hours at night ? Also it’s better for going to bed before 12 at night ? I don’t know these are myths or real things. But most people believe these. No doubt body need sleep. It has to shut down things and have to cool down like everything else the problem is how many hours ? I try to sleep 7 hours. These days i do my best goto bed at 11.30 or 12 and then I wake up at 6.30 a.m or 7 a.m. If sleep more than that I feel terrible.

I have read some medical articles say sleep connected to stress, rapid aging, diabetics, heard problems etc. But I have heard the iron lady of 80’s Margaret Thatcher said be slept only 4 hours at night. But maybe it depends on each person. Also there are several habits which even proven by scientists as good. Drinking glass was water before going to bed can decrease chances having a stroke in sleep. Also it says thinking something good before sleep can make your next day better. Reading few pages of a book before sleep known as good for health too.