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If you wake up feeling groggy, or have a hard time falling asleep, it’s a sign that your body clock is out of sync and you may need to reset it.

So here’s an easy way to do that: For one week, keep your blinds open all day and all night. Once the sun goes down, dim the lights in your house and reduce your use of electronics. It’s only one week, you can do it. Simply exposing yourself to the rising and setting sun will make it easier for you to fall asleep at night – and stay asleep – and wake up refreshed. That’s according to the journal Current Biology.