Sleep talking somniloquy explained : Most nights, consciousness doesn’t shut off all at once. It gradually fades as the brain moves through different stages of sleep, each with its own pattern of activity. Awareness drops, the body becomes still, and speech normally disappears completely.
But sometimes, words still slip through. This is sleep talking, scientifically called somniloquy, a condition where people speak during sleep without being aware of it, as per a report.