Why Do Humans Talk In Their Sleep? An Evolutionary Biologist Explains
Sleep talking, or somniloquy, occurs in two distinct ways depending on the sleep stage. During NREM sleep, it can manifest as brief, garbled utterances due to "motor cortex leakage." In contrast, REM sleep can produce more coherent dream speech if the paralysis mechanism fails, allowing vocalizations to escape into the waking world. Linguistic analysis reveals that sleep talk often includes negations, questions, and profanities, surprisingly preserving grammatical structure and conversational turn-taking conventions. AI
