Teen insomnia.

Teen insomnia. Story Source:

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Lots of things you might do in the evening can make it hard for you to wind down and prevent you from falling asleep quickly.

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Melatonin and another hormone, serotonin, help regulate a person's sleep—wake cycles.

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What can I do to start sleeping better again?

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But this is just an average.

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Skipping sleep can be harmful — even deadly, particularly if you are behind the wheel.

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