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From WHYY in Philadelphia

Different parts of the brain aren't always in the same stage of sleep at the same time, notes neurologist and author Guy Leschziner. When this happens, an individual might order a pizza or go out for a drive — while technically still being fast asleep. Frederic Cirou/PhotoAlto/Getty Images hide caption

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Frederic Cirou/PhotoAlto/Getty Images

Your Health

From Insomnia To Sexsomnia, Unlocking The 'Secret World' Of Sleep

Neurologist Guy Leschziner, author of The Nocturnal Brain, says the brain can be in different sleep stages at once — which explains why people sometimes walk, eat and even have sex when sleeping.

Different parts of the brain aren't always in the same stage of sleep at the same time, notes neurologist and author Guy Leschziner. When this happens, an individual might order a pizza or go out for a drive — while technically still being fast asleep. Frederic Cirou/PhotoAlto/Getty Images hide caption

toggle caption
Frederic Cirou/PhotoAlto/Getty Images

From Insomnia To Sexsomnia, Unlocking The 'Secret World' Of Sleep

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Last Summer Lostprophets
Low Gravity The Acorn
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I'll See You in My Dreams Dave McKenna
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We Are All Snowflakes Hior Chronik & Yoshinori Takezawa
Spy Meeting
Rebirth of Slick (Cool Like Dat) Digable Planets
Mardi Gras Mambo Hawketts

Fresh AirFresh Air

From WHYY in Philadelphia