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How to fall asleep fast
Keep your room dark.
Keep lights dim an hour before bedtime, and turn off all overhead lights, night lights, and lamps when you go to bed. Any bright light (not just electronic devices' screens) can trick your body into thinking it's too early in the day for sleep.
If you want to read or write before bed, try using a small book light rather than a desktop lamp or overhead light. Bluish light can keep you awake, so go for a bulb that gives off a warm glow.