REM sleep behavior disorder is best described as

REM sleep behavior disorder is best described as

• A. A daytime sleepiness disorder
• B. Dream enactment or movement during REM sleep due to loss of normal muscle atonia
• C. Dream enactment during non-REM sleep
• D. Snoring and gasping during sleep

Answer: (B)

REM sleep behavior disorder happens when the normal muscle paralysis that occurs during REM sleep is lost or incomplete. Normally, during REM, your brain activates dreams but your body stays asleep and immobile to prevent acting them out. When that REM atonia is absent, you may physically enact dreams—thrashing, kicking, punching, talking, or getting out of bed—sometimes injuring yourself or a bed partner. This dream enactment during REM is the defining feature and often points to underlying brainstem circuitry dysfunction involved in REM atonia. It’s not simply daytime sleepiness, which points to other sleep disorders. Dream enactment during non-REM sleep isn’t characteristic because vivid dreaming and REM-associated atonia loss occur specifically in REM sleep, not during non-REM stages. Snoring and gasping reflect obstructive sleep-related breathing problems, not REM sleep without atonia.

REM sleep behavior disorder happens when the normal muscle paralysis that occurs during REM sleep is lost or incomplete. Normally, during REM, your brain activates dreams but your body stays asleep and immobile to prevent acting them out. When that REM atonia is absent, you may physically enact dreams—thrashing, kicking, punching, talking, or getting out of bed—sometimes injuring yourself or a bed partner. This dream enactment during REM is the defining feature and often points to underlying brainstem circuitry dysfunction involved in REM atonia.

It’s not simply daytime sleepiness, which points to other sleep disorders. Dream enactment during non-REM sleep isn’t characteristic because vivid dreaming and REM-associated atonia loss occur specifically in REM sleep, not during non-REM stages. Snoring and gasping reflect obstructive sleep-related breathing problems, not REM sleep without atonia.