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i have only pulled all-nigher's in undergrad before the last exam in a series of exams that i had over one week because i had not had a chance to study for it. it worked fine for me then, but i have been trying to study 2-3 hrs a night in med school and did really well on the first round of exams. i think it would also suck because we have 8 hour exam days. but, i am the type of person where i will almost always wake up after sleeping 6.5 hours and can't get back to sleep. normally if i go a whole week with only 4-5 hours of sleep per night, then i will sleep like 8 hrs on fri night and 7 on sat night. now, my gf on the other hand regularly sleeps 9-10 hours.