More about how grouchy we get without enough sleep...results of the test are helping determine if someone has pathological psychiatric patterns when deprived of sleep...and figure out if one has a psychiatric disease or a sleep disorder...BD

WASHINGTON (Reuters) - A few nights without sleep can not only make people tired and emotional, but may actually put the brain into a primitive "fight or flight" state, researchers said on Wednesday. Brain images of otherwise healthy men and women showed two full days without sleep seemed to rewire their brains, re-directing activity from the calming and rational prefrontal cortex to the "fear center" -- the amygdala.

Brain study: Sleepy, grumpy and ... primitive? | Science | Reuters


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