Brain study: Sleepy, grumpy and ... primitive?

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