What disorder involves involuntary limb movements during sleep onset?

What disorder involves involuntary limb movements during sleep onset?

• A. Restless Leg Syndrome (RLS)
• B. Insomnia
• C. Excessive Daytime Sleepiness
• D. Periodic Limb Movement Disorder (PLMD)

Answer: (D)

Periodic limb movement disorder is defined by involuntary, repetitive limb movements that occur during sleep, including as you fall asleep. These movements—often involving the legs—tend to occur at regular intervals and can fragment sleep, leading to nonrestorative sleep and daytime fatigue. Restless legs syndrome, by contrast, involves uncomfortable sensations in the legs with an urge to move that starts while you’re resting, especially in the evening, and is not defined by movements occurring during sleep itself. Insomnia describes difficulty falling or staying asleep without specifying motor activity, and excessive daytime sleepiness is a symptom of sleep disorders rather than a movement disorder. So the situation described best fits periodic limb movement disorder.

Periodic limb movement disorder is defined by involuntary, repetitive limb movements that occur during sleep, including as you fall asleep. These movements—often involving the legs—tend to occur at regular intervals and can fragment sleep, leading to nonrestorative sleep and daytime fatigue. Restless legs syndrome, by contrast, involves uncomfortable sensations in the legs with an urge to move that starts while you’re resting, especially in the evening, and is not defined by movements occurring during sleep itself. Insomnia describes difficulty falling or staying asleep without specifying motor activity, and excessive daytime sleepiness is a symptom of sleep disorders rather than a movement disorder. So the situation described best fits periodic limb movement disorder.