walkietalkie
Bluelighter
I'd agree with this. As documented here It seemed to be related to sleep, was almost similar to some kind of looping sleep paralysis.
I've noticed that the 'brain zaps' during mushroom trips are, basically, the same exact sensation felt when coming out of the sleep paralysis state; the being 'shocked' back into the waking state.
However, sometimes the sleep paralysis 'shocks' turn much more into a rather steady pulsating state which grows to an alarming overwhelming feeling sort of like being electrocuted. Likewise, on high doses or during intense moments of revelation in peak mushroom trances, the seizures dont stop as quickly as they should, or at least, seem to last much longer then they actually do, possibly because of being totally disoriented from the trance and exaggerating time.
Who can really know. It's frightening and joyful orgasmic in the same moment, not unlike every other paradoxical reaction to communicating with the 3rd impersonal party between being and nothing.