Why do people sleep talk?
Posted May 24, 2009
Why do people sleep talk?
In order to better understand parasomnias, it is important to understand what happens while we sleep. We start out awake when we lie down, close our eyes, and fall asleep, entering into light sleep, which then quickly gives way to deeper sleep.
This is referred to as a sleep cycle, and generally lasts between 90-120 minutes. Sleep cycles again several more times during the night, though as the night progresses. The different stages of sleep are characterized by distinct brain wave
patterns, as well as by differences in other physiologic parameters, such as muscle tone, eye movement, heart rate, breathing rate and patterns, and blood pressure. In REM sleep, dreams are most vivid and memorable. As one transitions between
the different stages of sleep, there can be brief awakenings, either partial or full, following which most people immediately return to sleep. Sometimes, however, there are strong pulls both to wakefulness and to deep sleep, and the result is
that part of the brain continues to be in slow wave sleep, while another part is simultaneously in a state of wakefulness. The behavioral consequence is one of the NREM parasomnias: sleep walking, sleep talking, sleep eating, confusional arousals,
night terrors. The person going through one of these is not aware of what she or he is doing and is often incoherent while it is happening, and has no recollection of it after. Dennis Rosen, M.D.