In 1966, researchers worked to find links between heredity and<unk> . Their research suggests the following:<unk>  parents are more likely to have children who sleep-talk.<unk>  can still occur, though much less commonly, when neither parent has a history of<unk> . *A large portion of people begin to sleep-talk later in life without any prior history of<unk>  during childhood or adolescence.<unk>  by itself is typically harmless; however, it can wake others and cause them consternation—especially when misinterpreted as conscious speech by an observer. If the<unk>  is dramatic, emotional, or profane it may be a sign of another sleep disorder.<unk>  can be monitored by a partner or by using an audio recording device; devices which remain idle until detecting a sound are ideal for this purpose. Polysomnography (sleep recording) shows that episodes of<unk>  that can occur in any stage of sleep. Stress can also cause<unk> . In one study, about 30% of people who suffered from PTSD (post-traumatic stress disorder) talk in their sleep. A 1990 study showed that Vietnam War veterans having PTSD report<unk>  more in their sleep than in people without PTSD.<unk>  can also be caused by depression, sleep deprivation, day-time drowsiness, alcohol, and fever. It often occurs in association with other sleep disorders such as confusional arousals, sleep apnea, and REM sleep behavior disorder. In rare cases, adult-onset<unk>  is linked with a psychiatric disorder or nocturnal seizure.
Sleep-talking
Sleep emailing
Free-running sleep
Mood swing
Microsleep
Twilight sleep
Eating recovery
Proning