Oh jeez four days to do whatever is awesome but it goes by so fast. Definitely enjoy the free time but I'm not gonna see a lot of it once school starts in three weeks. Get some rest!
I know exactly how you feel. I work 3 days a week (12hrs/day) On my days off I stay up til 1 or 2 am. The night before work I gotta go to sleep early but it is so hard cuz my body is so used to staying up late. Wake up at 3am. UGH. Hang in there my friend.