There are some days that start off with the feeling, "I can't wait until I go back to sleep." For some reason, largely unrelated to the amount of sleep we get, we seem to crave more time; we want shut-eye. Researchers have studied this phenomenon and say there is far more to sleep than actual catch-up of sleeping hours. Our brains need the down time as well. Our brains also need time to process memories. They are studying this using functional MRIs. The results are fascinating and clearly there is more to sleep than meets the eye.
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