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Is a Better Sleeping Pill on the Way?
Date:4/3/2013

By Amanda Gardner
HealthDay Reporter

WEDNESDAY, April 3 (HealthDay News) -- A new class of sleep medications appears to help people fall asleep without causing grogginess the next day, researchers say.

These new medications -- known as dual orexin receptor antagonists (DORA) -- target a more specific region of the brain than popular sleep drugs such as Ambien and Lunesta, promoting sleep without affecting learning and memory (also called "cognition"), according to the new research.

"We've shown that these compounds improve sleep at doses that don't impact cognition," said Jason Uslaner, lead author of a study published in the April 3 issue of Science Translational Medicine. Uslaner is director of In Vivo Pharmacology at Merck & Co., which funded the study.

Merck already has one such drug, suvorexant, under review by the U.S. Food and Drug Administration (FDA).

More than 30 million Americans struggle to get a good night's sleep, and about one-third of these use drugs to help the process, the study authors pointed out.

But widely prescribed sleep medications such as Ambien (zolpidem) and Lunesta (eszopiclone) can leave people feeling hung over and inattentive the next day. So much so that the FDA recently cut recommended doses of Ambien and other drugs that contain zolpidem for fear that their use, even the night before, might impair driving or other activities the next day.

Lunesta and Ambien affect GABA receptors, which are found throughout the brain and are associated with side effects, including thinking disturbances, and deficits in attention and memory, explained Uslaner.

About 15 years ago, scientists discovered chemical messengers known as orexins, which are released by a relatively small brain region known as the lateral hypothalamus. This area of the brain releases orexins during the day to keep us awake and lowers levels at night so we can sleep.

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