What’s wrong with talking and shouting in your sleep? The most likely reasons for the above phenomenon are the following: the first is a physiological phenomenon. Many people have the experience of dreaming, and some children and even adults even appear to speak loudly and shout when they dream, which is a physiological phenomenon. If the mental state is good during the day and does not affect work and study and daytime functions, then this phenomenon is normal for patients. Moreover, modern medical research has confirmed that dreaming is actually helpful in consolidating what we have learned during the day and forming new memories. The second aspect may be a pathological phenomenon, especially if seen in the elderly, shouting loudly, if there is waving fists, or even getting up and kicking the legs, and injuring the sleeping partner next to you, you need to consider if you have rapid eye movement sleep behavior disorder, also called RBD, which often suggests that the patient may have the possibility of Parkinson’s disease.