Word: braine
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...brain can take a bad hit too in the form of stroke. About 75% of strokes are caused by a blood clot or loose plaque racing through the system and lodging in the vessels of the brain, where it cuts off the flow of oxygenated blood. Other strokes are essentially hemorrhages, ruptures in brain vessels that give way under elevated pressure...
Scientists studying Alzheimer's disease have also uncovered a possible link to uncontrolled blood pressure. When they scrutinized the brain vessels of people who had died of Alzheimer's, they found that those with a history of hypertension during middle age had tiny changes that did not appear in healthy individuals. "The question is, Where do the micro changes come from--longstanding hypertension or high cholesterol?" says Dr. Richard Mayeux, co-director of Columbia University's Alzheimer's research center, who is studying the connection. If either of them turns out to be involved, controlling both may be an unexpected...
...that yawn and push through the night. Sure, you've been awake 16 hours, but you have a giant thermos of coffee and a few tunes to keep you going. Your body, of course, is fighting you every step of the way. Whether or not you realize it, your brain has already started to check out for the night...
...refresh the body? Not really. Researchers have yet to find any vital biological function that sleep restores. As far as anyone can tell, muscles don't need sleep, just intermittent periods of relaxation. The rest of the body chugs along seemingly unaware of whether the brain is asleep or awake...
...refresh the mind? That's closer to the mark. The brain benefits from a good night's sleep. But there is no agreement among sleep researchers about what form that benefit takes. One theory is that sleep allows the brain to review and consolidate all the streams of information it gathered while awake. Another suggests that we sleep in order to allow the brain to stock up on fuel and flush out wastes. A third, which has been gaining currency, is that sleep operates in some mysterious way to help you master various skills, such as how to play...