I kept thinking of "spazzing out" but that doesn't quite seem to be it. An example is when you're very tired and kind of dozing off and you say something or ask a question that is incredibly stupid and makes no sense.
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This may not be very close to what you are looking for, but freudian slip could be considered. I am suggesting the idiom because the definitions below do hint at saying something stupid.
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"Spazzing out" (which is a bit derogatory but not especially offensive) is more about being clumsy. "Spacing out" or "zoning out" cover the sleepy part of the question, but don't really address talking. "Brain fart" does a better job, but that doesn't necessarily have anything to do with dozing off. Really, I'm not too familiar with anyone speaking, sensibly or not, as they doze off. When someone talks in their sleep it is usually pretty silly, but that comes entirely from the unconscious mind. I'm not sure there is a word for this. |
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The general English term is sleep talk (or sleep talking). The Latin medical term is somniloquy. Sleep talk can be intelligible or pure gibberish. It can occur in any stage of sleep, including the first stage as one is falling asleep. A starting point for more information is the “Somniloquy” entry at Wikipedia.¹ |
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