, According to a scientific study that talk during sleep usually occurs during the turmoilof transition, ie when no body moves smoothly from one stage of sleep to another stage. Due researchers this matter to several reasons, including / tension and intense fear of the issue of what makes the subconscious mind itself is unable to endurance totake a cut of this tension is also mental fatigue and sexual repression, causing speechduring sleep where the brain loses control over some of its parts, which they must rest.study points to the need to exercise to reduce speech during sleep.