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(A) There is an abrupt arousal out of stage N3 sleep followed by prominent phasic EMG leg activity associated with vigorous bilateral leg kicking. (B) Stage REM epoch showing prominent excessive phasic EMG leg twitching associated with vigorous leg kicking. The heart rate is not increased despite the vigorous leg movements, which is typical for RBD, and in contrast to NREM arousal parasomnias. Chin atonia is generally preserved in this tracing.
