I find the right amount of sleep and a REGULAR sleeping pattern to be most important. I need about 7:30-8:00 hours of sleep, 6:00 is too little for me. I believe the average is around 8 hours a night in general.
I also find that it's not just how much I slept that night, but loosing sleep in the weekend, can affect me long into the week. Seeing the benefits of a regular sleeping pattern can easily take me a week.
Otherwise, you seem to be doing everything more or less right. Exercise, diet and so on. Maybe taking longer exercise breaks, like going for a run or to the gym for an hour, would help reset your mind a bit, and make it easier to keep studying when you get back.
Finally, do you snore or sound like you're choking when you sleep, or live in a very noisy area. This might seriously affect the quality of the sleep you're getting. I have a friend that had problems with this, who was often tired during the day, even though he got 8 hours of sleep.
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