Key Clinical Message: This study suggests that severe obstructive sleep apnea can present as sleep‐related epileptic or non‐epileptic seizures. A detailed history and physical examination, along with polysomnography and video electroencephalography findings can lead to the correct diagnosis. Obstructive sleep apnea (OSA) is defined by recurrent episodes of the upper airway complete or partial collapse while sleeping. The obstructive episodes result in gradual suffocation that increases breathing attempts till the person is awakened. The main manifestations are excessive daytime sleepiness, snoring, observed episodes of stopped breathing, and abrupt awakenings accompanied by gasping or choking. Nevertheless, there are very few reports of patients with OSA, manifesting other symptoms such as seizure‐like movements. Differentiating OSA with nocturnal seizures could be challenging due to their overlapping features. A 53‐year‐old man presented to the clinic, experiencing seizure‐like involuntary movements during nocturnal sleep for the past 2 years with a frequency of 2–3 times per night. Neurologic examinations were normal. Further evaluation with polysomnography revealed impaired arousal followed by seizure‐like movements during sleep. Video electroencephalography (EEG) did not show any epileptiform discharges, ruling out the nocturnal seizure diagnosis. The patient was diagnosed with OSA. Subsequently, continuous positive airway pressure (CPAP) treatment resolved all symptoms. [ABSTRACT FROM AUTHOR]