Wake up at 4:00am

Hello,

Why it is so important to wake up at 4:00am for someone in the path of enlightnement? To get the most benefices for the mind during meditation is it important for the body to feel tired or sleepy so the mind could detach from it easier?

Personally i try to relax during sleep so the body could get sleepy while maintaining the mind awake and then I wake up in my own sleep and couldnt move the body but at the end I failed to move with the mind too, i woke up after some time. Ive read in a little pratical book that the mind could use that state and move to another space. It says the physical body too enter another space float,or become invisible if someone could take advantages of those stages of sleep.