On a slightly different topic, we now know that a surprisingly large number of people suffer daytime "hallucinations without delusion" meaning they see things b

On a slightly different topic, we now know that a surprisingly large number of people suffer daytime "hallucinations without delusion" meaning they see things but they know the things are not real. And I've often wondered if that is some kind of dysfunction of the sleep cycle. If we think of dreams as a kind of hallucination, then is daytime "hallucination without delusion" a kind of dreaming while awake? I'd like to see more research on that question.