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.

See the source article by following the link below:
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.