Twitching movements of the fingers, toes, and mouth that may occur during stage W, non-REM, and REM sleep are known as:

Twitching movements of the fingers, toes, and mouth that may occur during stage W, non-REM, and REM sleep are known as:

• A. Bruxism
• B. REM sleep behavior disorder (RBD)
• C. Excessive fragmentary myoclonus (EFM)
• D. Rhythmic movement disorder (RMD)

Answer: (C)

Movements like brief, irregular twitches of the fingers, toes, and mouth across wakefulness, non-REM, and REM sleep are described as excessive fragmentary myoclonus. Myoclonus means sudden, brief muscle jerks; fragmentary indicates these jerks are isolated and non-rhythmic, while excessive means they occur more frequently than what’s typical. This pattern can appear across multiple sleep stages, not limited to one particular stage. Bruxism involves rhythmic jaw grinding or clenching, not these scattered finger, toe, and facial twitches, so it doesn’t fit. REM sleep behavior disorder features complex, dream-enacting movements that occur specifically during REM sleep, driven by loss of normal muscle atonia, not the brief fragmentary jerks described here. Rhythmic movement disorder shows repetitive, rhythmic movements (often in children), rather than irregular, fragmentary jerks. So the description aligns with excessive fragmentary myoclonus.

Movements like brief, irregular twitches of the fingers, toes, and mouth across wakefulness, non-REM, and REM sleep are described as excessive fragmentary myoclonus. Myoclonus means sudden, brief muscle jerks; fragmentary indicates these jerks are isolated and non-rhythmic, while excessive means they occur more frequently than what’s typical. This pattern can appear across multiple sleep stages, not limited to one particular stage. Bruxism involves rhythmic jaw grinding or clenching, not these scattered finger, toe, and facial twitches, so it doesn’t fit. REM sleep behavior disorder features complex, dream-enacting movements that occur specifically during REM sleep, driven by loss of normal muscle atonia, not the brief fragmentary jerks described here. Rhythmic movement disorder shows repetitive, rhythmic movements (often in children), rather than irregular, fragmentary jerks. So the description aligns with excessive fragmentary myoclonus.