A 19-year-old man presents with recurrent nocturnal attacks of stereotyped bicycling leg movements, pelvic thrusting, and bilateral asymmetric tonic posturing lasting 15–25 seconds, occurring multiple times per night. He maintains awareness during the events with no postictal confusion. Video-EEG monitoring is performed. The pattern marked **B** in the diagram—showing brief hyperkinetic seizure semiology with scalp EEG demonstrating only diffuse muscle artifact and subtle bifrontal or vertex slow waves—is captured during multiple events. Interictal EEG is largely normal. MRI is unremarkable. What is the most likely diagnosis?
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