I think that the traditional sleeping early/waking up early is the way to go. studying late through the night may not really be that good if students were to have a exam the next day, because they'd get sleepy/loose concentration halfway through.
im a night person, so i tend to come home, take a nap and then study at night...it varies from person to person of course, but whatever floats your boat then do it.
I prefer to study in the afternoon + early morning, but after school i just don't seem to have the energy to do work so i got to sleep, but that kind of stuffs my plan up.
Its a health thread coz it affects your health how you study and stuff. if you cant study, and concentrate, you get stresseed and that affects your health.
Normally i would study after uni or between classes, or never lol...so lazy and procrastination was a HUGE problem for me when i was at uni. I prefer to like come home and have a nap, and then do a few hrs study, that way your brain is fresh and able to think clearly.