Here’s how to deal.

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What Is Sleep Hygiene, Exactly?

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Our circadian rhythm (aka biological clock) synchronizes with exposure to light, she says.

Why do we tend to feel more tired in the winter?

What Do Dreams About Snakes Mean?

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scientist and the founder of Dr. Weiss Sleep Education

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We call our circadian rhythm our biological clock because it really does function like clockwork, says Dr. Weiss.

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Thats why Dr. Robbins suggests opting for just a20-minute power napsometime before 3 p.m. (We love theHatch Restore, $130.)

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scientist and the founder of Dr. Weiss Sleep Education

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