Final answer:
REM sleep behavior disorder (RBD) is a sleep disorder where individuals physically act out their dreams due to the absence of muscle paralysis during REM sleep.
Step-by-step explanation:
REM sleep behavior disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis during REM sleep, which can cause individuals to physically act out their dreams. Normally, during REM sleep, the body becomes paralyzed to prevent these actions. However, in RBD, this paralysis is incomplete or absent, resulting in movements such as kicking, punching, or talking during sleep. RBD is often associated with neurological conditions such as Parkinson's disease.
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