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Get enough sleep
You should get 7-9 hours of quality sleep every day. Insufficient sleep may lead to anxiety. If you find it hard to fall asleep, do something relaxing before bedtime, such as taking a warm bath, listening to calm music or breathing deeply.
And, if you become anxious right before going to bed, which is often a case, try to calm down for 10-15 minutes earlier in the day or try mental exercise, for example recite lyrics from your favorite song.
A few tips on how to shut off your brain during bed time are given here