Rapid eye movement sleep behavior disorder Rapid eye movement sleep behavior disorder Rapid eye movement sleep behavior disorder (RBD) is a sleep disorder (more specifically a parasomnia) in which people act out their dreams. It involves abnormal behavior during the sleep phase with rapid eye movement (REM) sleep. The major feature of RBD is loss of muscle atonia (i.e., the loss of paralysis) during otherwise intact REM sleep (during which paralysis is not only normal but necessary). REM sleep is the stage of sleep in which most vivid dreaming occurs. The loss of motor inhibition leads to a wide spectrum of behavioral release during sleep. This
Activation-synthesis hypothesis the stages of sleep that show greatly decreased brain activity. There are four different stages of NREM sleep. The brain shows dulled or limited senses of perception, though the thought process has been shown to be logical and perseverative. Episodic movements of the body occur during these stages, though they are involuntary movements. REM sleep is an evolutionarily recent behavior of humans. REM stands for rapid eye movement. It is the deepest sleep a mammal can go into. It is regulated by the pontine brainstem. Infants spend most of their time in REM sleep, and rather than enter stage 1