I’ve heard the theory somewhere that all dreams are more-or-less invented by the brain at the moment you wake up. So, your brain could just invent a narrative t

I’ve heard the theory somewhere that all dreams are more-or-less invented by the brain at the moment you wake up. So, your brain could just invent a narrative that ends with the loud thud that wakes you up. Not sure if this is actually the truth, or just some random speculation, so heap of salt and all that. Also, I have no idea how to test it. Sometimes I my significant other sleep-talks, and sometimes it is clear enough that I’ll answer (misunderstanding it to be regular talk). It is quite rare (although not unheard of) for them to remember what lead to a sleep conversation, which leads me to believe that whatever their brain is doing at night, it doesn’t have much to do with the dreams they remember. But that’s pretty dang anecdotal! Edit: the sleep-talks they do remember could just explained by waking up in the middle of the night to find the memory of the sleep-talk in their short term memory, and then the brain retroactively spins up a dream to fit it, of course.