Personally, I run best on about 6.5-7 hours of sleep per night. If I sleep 8 hrs or more, I tend to actually feel more lethargic and tired when I wake up than I do if I sleep about 7 hrs. I think the amount of sleep you need is a very individual, personal thing though that can vary depending on your bodychemistry, lifestyle etc. My dad has gone his entire life sleeping exactly 6 hours per night, waking up at 5:30 am and going to bed shortly after 11pm every single day. My mom, on the other hand, really really needs a full 8 - 8.5 hours of sleep or she struggles. So the advice of "if you feel tired, you probably need more sleep" given above is probably the best advice you can get - just try to pay attention to your energy levels and listen to your body, there isn't an exact number that anyone can give to anyone else.
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