I do this ALL the time. On weekends me and my friends will normally hang out ntil around 3 or 4 am and wake up around 12. Usually if we do this on a friday we will do the same that saturday and I always use sundays to recover and usually sleep most of the day and end up waking up at like 8.
I actually looked into this because it was such a pain in the ass having to function in school with no sleep and I found that getting 4 hours of sleep is more beneficial than 5 hours, although 8 is the recommended amount as most of you know, so usually if I can't get close to 8 I'll just hang out until its about 4 hours away form when I wake up.
__________________
|