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Make sure your room is dark, and set to a slightly cold temperature to promote good sleep.
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Reading a book can help you fall asleep, just make sure the book isn't to entertaining; boring subjects might work best.
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Keep your bed/wake up times consistent throughout the week, and allow enough sleep each night.
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Try and put devices away at least 30 minutes before bedtime (90 minutes for best results).
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This will help promote good sleep by keeping you satiated through the night.
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This will put all the ideas you have in your head on paper so you can have an empty mind while trying to sleep.