In medical terms, it is a nightmare disorder, a type of sleep disorder in which the patient experiences fear, nervousness, moaning and even immobility during sleep due to intense anxiety as well as vividly remembered horrific dreams. Frequent episodes can affect the quality of sleep and cause mental states such as anxiety and depression. The patient’s already unstable mental state, coupled with psychological factors such as depression, anxiety and stress, can lead to a degree of hearing hallucinations and a self-consciousness of tinnitus and brain ringing.