<unk>  is very common and is reported in 50% of young children at least once a year. A large percentage of people progressively<unk> -talk less often after the age of 25. A sizable proportion of people without any episode during their childhood begin to<unk> -talk in adult life.<unk>  may be hereditary. In a study reporting the prevalence of<unk>  in childhood, the authors reported that the frequency of<unk>  differs between children. About half of the children have<unk>  episodes at least once a year, but less than 10% of children present<unk>  every night, whereas 20% to 25% talk in their<unk>  at least once a week. In addition, they did not find any difference between gender or socioeconomic class. However, valid estimation of the prevalence of this phenomenon is difficult as the<unk> -talker either does not remember or are not aware of their<unk> . The same uncertainty exists concerning the age of onset because early occurrences may have escaped notice. Thus, there are disparate results regarding its prevalence in the literature.
Sleep-talking
Sleep emailing
Free-running sleep
Mood swing
Microsleep
Twilight sleep
Eating recovery
Proning