Sounds to me like you need a Central Sleep Apnea oriented sleep study. Lack of O2 during sleep will cause these seizure like activities. I finally have an appointment with a sleep pulmonologist next month. I sometimes wake from sleep with a startled feeling and feeling like I am suffocating. The mini-anxiety attack is the brain's reaction to the need for oxygen, at least in my understanding.

An EEG with a sleep session may help. It is how I learned I have Central Sleep Apnea.