Sensory feedback
(i.e., reafference) from twitching limbs provides another source of stimulation to the
cortex. In RBD, degeneration of sleep-related neural circuits may lead to disinhibition
of brainstem structures that control motor behavior (e.g., red nucleus, superior colliculus),
resulting in exaggerated twitching, violent limb movements, and/or complex
behavior, with concomitant effects on dream mentation.