Saturday, November 15, 2008

Your Brain Goes to Sleep (and Wakes Up) in Pieces

If you're too tired to think straight, it might be because parts of your brain are already asleep at the wheel. Scientists are challenging the belief that a specific region of the brain makes the call to hit the sack. Instead, our brains power down in stages, they say. If a certain group of cells in our brain gets fatigued, it simply shuts off.

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