In the sleep disturbance known as _____, muscle twitches, primarily in the legs, occur every 20 to 40 seconds, severely disturbing sleep.

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Periodic limb movement syndrome is characterized by involuntary muscle contractions, primarily in the legs, that can occur every 20-40 seconds during sleep, causing significant sleep disturbances. Cataplexy refers to sudden loss of muscle tone, usually triggered by strong emotions, somnambulism refers to sleepwalking, and hypnic jerk syndrome is a harmless and common condition characterized by sudden muscle jerks or twitches during the transition from wakefulness to sleep.

In the Sleep Disturbance Known as _____, Muscle Twitches, Primarily