How long hours do you spend in sleep?

How long hours do you spend in sleep?

If you want to be a successful person, how long is better?

Bad days I'm a college student .Today is announcement of cet4 results.But it's a bad news for me.The standard of results is 425, I only got 423 points.This is my three times for taking aprat it.It's meaning that I have to lose this opportunity to get scholarship for last term.The cet4 will be change Next time ,the eassy type test item will be new.So I am so scared to meet it.