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Whether you’re a night owl or an early bird, your sleep is regulated by your circadian rhythm. A sleep expert helps unravel the mystery of our internal clock.

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“Both sleep and cortisol are connected to the ability to learn and perform academic tasks,” said researcher Jennifer Heissel. “Our study identifies a pathway by which violent crime may get under the skin to affect academic performance.”

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Older adults who say their lives have meaning are more likely to get a good night’s sleep and less likely to suffer from sleep apnea and restless leg syndrome, according to a new study.

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Deep sleep is vital to memory and decreases with age. Playing pink noise – described as a waterfall-like sound – in sync with a person’s brain waves was found to enhance deep sleep and sleep-dependent memory retention in older adults, according to a new Northwestern study.

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She's the co-founder and editor-in-chief of The Huffington Post and a syndicated columnist. Arianna Huffington talks about the wake-up call that led her to write her 15th book, "The Sleep Revolution."

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(Credit traska / Flickr)

“People need to think of adequate sleep as an important aspect of maintaining good health," said Erin Hanlon, Ph.D., lead author of a new University of Chicago study linking insufficient sleep with increased consumption of snacks and high-energy, high-fat foods.