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Non-24-Hour Sleep-Wake Rhythm Disorder

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Circadian Rhythm Sleep-Wake Disorders
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Abstract

Non-24-hour sleep/wake rhythm disorder (non-24) most commonly presents in totally blind individuals and results from the loss of synchronization (entrainment) of the hypothalamic circadian pacemaker to the 24-hour day. The etiology of the disorder in the sighted is likely distinct from that in the blind and has yet to be definitively demonstrated. Diagnosis of this disorder is based on the patient’s report of relapsing and remitting symptoms of daytime hypersomnolence and/or nighttime insomnia as well as sleep/wake timing that can drift progressively later or earlier each day as documented by sleep diaries or wrist actigraphy. Both melatonin and the melatonin agonist tasimelteon have been shown to successfully entrain the circadian pacemaker in placebo-controlled trials and thereby treat the disorder. The clinician must carefully consider both the time and dose of melatonin administration to achieve the optimal clinical result. Controlled trials of light or melatonin are lacking in the treatment of non-24 among the sighted, but the use of both may be effective when the patients’ self-selected light/dark schedules are taken into account.

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Emens, J. (2020). Non-24-Hour Sleep-Wake Rhythm Disorder. In: Auger, R. (eds) Circadian Rhythm Sleep-Wake Disorders. Springer, Cham. https://doi.org/10.1007/978-3-030-43803-6_9

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  • DOI: https://doi.org/10.1007/978-3-030-43803-6_9

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