7/2/2023 0 Comments Parasomnia by Eric DesmaraisThere are two criterion-based classifications of sleep disorders: the Diagnostic and Statistical Manual of Mental Disorders, fifth edition (DSM-V) classification 2 and the International Classification of Sleep Disorders (ICSD) classification. Parasomnias occur when transitions between these stages are blurred (commonly between stages III/IV and the awake state), causing behaviours that lack the complete awareness and mentation associated with wakefulness. Nonrapid eye movement sleep is subdivided into four stages: stage I, a transitional stage between wake and sleep stage II, which makes up most of the sleep period and stages III and IV, which typically occur in the first half of the night and during which more profound stimulus is required to wake the sleeper. 1 Although more common in children, parasomnias can occur at any age.ĭuring sleep, the brain cycles regularly between wakefulness, nonrapid eye movement (NREM) sleep and rapid eye movement (REM) sleep. Sleepwalking, sleep terrors, sleeptalking and sleep paralysis are some of the behavioural manifestations associated with the partial arousals from sleep known as parasomnias - a group of sleep disorders defined as undesirable physical events or experiences that occur during the initiation of sleep, during sleep or during arousal from sleep.
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