Anywhere form 5-7 hours of sleep... But lately I have been sleeping earlier so I have been getting at least 8 hours but I still just as tired as getting 5-7 hours so I think I will go back to 5-7 hours of sleep so I can get more of my studying done!
6-8 hours are enough for me unless I woke up early the previous day and had a busy schedule. My body will tell me that I'm tired and I would retire earlier than normal. I'll be back to normal the following morning.