Sleep in humans is divided in two main phases: non-REM sleep, which occupies most of our early sleep night, and REM sleep, during which our dreams prevail. Non-REM sleep is usually considered as a compensatory 'resting' state for the brain, following the intense waking brain activity. Now, new research challenges previous brain imaging studies which showed that the brain was less active during periods of non-REM sleep as compared to periods of wakefulness.
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