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Other have already answered with some good tips, but let me also add that you might want to go to a doctor. There might be a reason for your insomnia, and you could potentially get things like a scan of your brain to see which area is affected when you are unable to sleep.

Make your bedroom comfortable, Make your bedroom dark, Develop relaxing bedtime rituals, Don't go to bed hungry, Reduce your stress levels, Exercise regularly during the day thats the way to overcame insomnia disease.

Thanks you so much my friend