Revolutionary exam prep/revision idea

I've noticed i'm a lot more productive and awake during the last few hours leading up to the ol' bed time. Why not maximise this time? I propose sleeping during the day, lets say, since most exams start either 9.30 or 12.30 and go on for 2-3 hours, sleeping from 16.00 till about 23.00 in the evening. No one on snapchat or insta or any other distractions (apart from youtube... self control i guess?) which forces me to do revision until my morning exam where I'll have stored and crammed loads of short term memory info for the exam whilst also feel not too bad since its the usual 4-5 hours before I go to sleep.

Or am I an absolute idiot?