About 4% of American adults are affected by<unk> s. Women seem to be more affected than men, the ratio being 2-4 : 1. This inequality decreases with aging because of a less high prevalence in elderly women. However, it is still unclear if the difference of prevalence between men and women is real or if it reflects a higher dream recall capacity of women. According to studies, children at the age of 6–10 years are 41% more likely to experience<unk> s and 22% at the age of 11. Children with persistent<unk> s range from 10% to 50%. However, only 1% of children meet the criteria of a<unk> . Some factors tend to predict the development of a disorder from the presence of<unk> s during childhood, such as a fear of going to sleep or going back to bed after a<unk> , an irregular sleep life and an avoidance of thinking about the<unk> .
Nightmare disorder
Exploding head syndrome
Idiopathic hypersomnia
Listener fatigue
Advanced sleep phase disorder
Circadian rhythm sleep disorder
Jurosomatic illness
Interictal dysphoric disorder