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From a hypnosis perspective I would say that he falls in somnambulistic trance state. I however don't know people regularly falling into such a state 2-3 times a day for no reason.
How well does he sleep? It might be interesting to get a Smartwatch with sensors to see whether his vital signs change in those episodes.
I'll ask him how he sleeps when i talk to him next time i'll also mention the possibility of trying a Smartwatch.