Science explains why you wake up at 3 a.m., and how to go back to sleep

About one in five people have middle-of-the-night insomnia.

[Photo: Getty Images]

What should you do if you wake up in the middle of the night and can’t fall back asleep? This is one of the most common—and frustrating—forms of insomnia. It turns out there’s a biological reason for it. And there are things you can do that may help you drop off again quickly.

If you’re an entrepreneur or business leader, this may have happened to you more than once. Starting a business and being responsible for a team of employees means you may have a lot to worry about. In the middle of the night, those worries seem to grow more powerful........

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