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Parasomnias are a category of sleep disorders that involve abnormal movements, behaviors, emotions, perceptions, ... thus it can also be considered dangerous. [14]
Sleep terrors (STs) potentially frightening parasomnia but are not REM based and there is a lack of awareness to surroundings, characteristic screams during STs. Noctural panic attacks (NPAs) involves fear and acute distress but lacks paralysis and dream imagery
More specifically, nightmare disorder is a type of parasomnia, a subset of sleep disorders categorized by abnormal movement or behavior or verbal actions during sleep or shortly before or after. Other parasomnias include sleepwalking, sleep terrors, bedwetting, and sleep paralysis. [3]
These are all clinically documented cases of sleep sex, or sexsomnia, part of a family of sleep disorders called parasomnias that include sleepwalking, sleep talking, sleep eating and sleep terrors.
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Night terror, also called sleep terror, is a sleep disorder causing feelings of panic or dread and typically occurring during the first hours of stage 3–4 non-rapid eye movement (NREM) sleep [1] and lasting for 1 to 10 minutes. [2]
Other conditions are similar to RBD in that individuals exhibit excessive sleep movement and potentially violent behavior. Such disorders include non-REM parasomnias (sleepwalking, sleep terrors), periodic limb movement disorder, severe obstructive sleep apnea, and dissociative disorders. [4]
Sleepwalking, also known as somnambulism or noctambulism, is a phenomenon of combined sleep and wakefulness. [1] It is classified as a sleep disorder belonging to the parasomnia family. [2]