According to the International Classification of Sleep Disorders-Third Edition (ICSD-3), the<unk>  disorder, together with REM sleep behaviour disorder (RBD) and recurrent isolated sleep paralysis, form the REM-related parasomnias subcategory of the Parasomnias cluster.<unk> s may be idiopathic without any signs of psychopathology or associated with disorders like stress, anxiety, substance abuse, psychiatric illness or PTSD (>80% of PTSD patients report<unk> s). As regarding the dream content of the dreams they are usually imprinting negative emotions like sadness, fear or rage. According to the clinical studies the content can include being chased, injury or death of others, falling, natural disasters or accidents. Typical dreams or recurrent dreams may also have some of these topics.
Nightmare
Night terror  Night terror  1
Nightscout
Twilight sleep
Sleep onset
Mental health day
Yawn
Sleep sex