When I was in high school I had a digital radio alarm clock. I had my alarm set at 6am. There was a time over the course of a month, where every single day, I would wake up at 5:59, and as my hand was reaching over to disable it, the alarm would go off mid-slap. It was at this point I realized how good our internal clocks are (to the second?), and I haven't used an alarm clock since. The trick is going to bed on time. Also, mental exercise is far more tiring than physical exercise. If you can't sleep you aren't working your brain hard enough.
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When I was in high school I had a digital radio alarm clock. I had my alarm set at 6am. There was a time over the course of a month, where every single day, I would wake up at 5:59, and as my hand was reaching over to disable it, the alarm would go off mid-slap. It was at this point I realized how good our internal clocks are (to the second?), and I haven't used an alarm clock since. The trick is going to bed on time. Also, mental exercise is far more tiring than physical exercise. If you can't sleep you aren't working your brain hard enough.