Doctors, pilots, Bill Clinton, etc. train themselves to function on an abnormally small amount of sleep. As with any real physical thing, you can't just go out and start doing it - you have to slowly work up to it.
Doctor friend of mine says that he learned to sleep for about 4 hours a night by a very simple method - at first, sleep for 8 hours, but set your alarm clock to wake you up after four. Then, gradually cut back, always waking up after four hours. Eventually, you'll get to the point when you can simply wake up at that four hour point and stay up.
Myself, I usually function on 5-6 hours of sleep with a 90minute nap when I get home from work (I work nights). Sleeping longer than 8 hours a day makes me exceptionally tired - I don't feel rested at all.
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"I've made only one mistake in my life. But I made it over and over and over. That was saying 'yes' when I meant 'no'. Forgive me."
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