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As others say, alcohol causes sleep problems. Though it helps you fall asleep, once the alcohol leaves your system it pulls you out of sleep.
Caffeine, coffee, colas etc. staying up late, inconsistent bed time. A feeling of "I don't need much sleep, 5 hours is enough", as you age you need more sleep, particularly to deal with stress. These things all contribute to training your brain to stay awake.
Also a dark, cool bedroom, quiet etc. Regular exercise. Etc.
The part about the alcohol sucks, the caffeine too. Oh, and the exercise.
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