Neuroscientists identified a neural circuit in the brain that regulates REM sleep, the phase of sleep when dreams occur. The new study also showed how REM sleep controls the physiology of non-REM sleep, the other major sleep phase commonly believed to be important for memory consolidation.
Sleep is a complex phenomenon composed of two distinct states of consciousness: REM (rapid eye movement) sleep and non-REM sleep, Dr. Yu Hayashi of the International Institute for Integrative Sleep Medicine at University of Tsukuba explained. REM sleep is a time of dreams and desynchronized brain wave activity, while during non-REM sleep, large, slow waves of activity sweep through the brain.
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