if I sleep at 12:30 AM and wake at 4:30 AM will I be able to remember things I studied? this coming Saturday i have a science exam and I'm super back it will take a lot of time so that's why if i sleep this time will be able to sleep well and remember? if not can u tell me a sufficient time I have to go to school at 6 o clock and I needa revision before going to school for all 3 subjects bio, phy and chem