Non-24-h sleep-wake rhythm disorder is quite rare in sighted patients and frequently associated with psychiatric disorders. We report the case of a 46-year-old man with autism spectrum disorder (ASD) and agoraphobia who had been referred for a suspicion of obstructive sleep apnea syndrome (OSAS). Polysomnography and arterial blood gas confirmed moderate OSAS associated with hypoventilation. Continuous positive airway pressure (CPAP) was started on fixed mode with excellent results. At follow-up, his CPAP report data revealed an irregular sleep-wake rhythm with a progressive offset of sleep schedule and wake time delayed from 1 h from day to day. Melatonin (or agonist) is efficacious and safe for long-term treatment in ASD and circadian rhythm sleep-wake disorder (CRSWD) with light therapy and wakefulness promoting medication. This case underlines the importance to sensitise psychiatrists to sleep and CRSWD, and also that CPAP data offer a possible objective alternative to sleep diary.
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http://dx.doi.org/10.1111/jsr.13859 | DOI Listing |
Alzheimers Dement
December 2024
Columbia University, New York, NY, USA.
Background: As high as 50% of Alzheimer's disease (AD) patients experience "sundowning", which refers to an increased severity of neuropsychiatric symptoms (NPS), including agitation, confusion, and anxiety, selectively in the evening. Although sundowning significantly influences the decision to institutionalize patients, few preclinical models of this phenomenon exist and the underlying neural mechanisms are unknown. Here, we establish a model of sundowning by phenotyping the sleep-wake cycle and anxiety and exploratory behavior at different times of day in an AD mouse model.
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December 2024
University of Kentucky, Lexington, KY, USA.
Background: Alzheimer's disease is defined by the pathological aggregation of amyloid-beta and hyperphosphorylated tau. AD patients often exhibit other symptoms like metabolic and sleep dysfunction. Currently, it is unclear if impairments are a cause or consequence of Aβ or tau aggregation.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
Faculty of Health, Medicine and Life Sciences, School for Mental Health and Neuroscience, Alzheimer Centre Limburg, Maastricht University, Maastricht, The Netherlands, Maastricht, Netherlands; Gordon Center for Medical Imaging, Massachusetts General Hospital/Harvard Medical School, Boston, MA, USA.
Background: The brainstem locus coeruleus (LC) is among the first sites of Alzheimer's disease (AD) pathology, accruing hyperphosphorylated tau as early as in young adulthood. Animal studies indicate that the LC is crucially involved in sleep-wake regulation, a recently established factor contributing to AD-related pathophysiological processes. However, the associations between LC integrity and sleep-wake phenotypes in the context of AD pathology remain poorly characterized in humans.
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December 2024
University of Bristol, Bristol, United Kingdom.
Background: Homeostatic sleep regulation is theorized to be governed by the 'Two Process Model' where circadian rhythm (process C) and homeostatic sleep pressure (process S) interact to determine sleep versus wakefulness. Sleep pressure accumulated during prolonged wakefulness increases the duration and intensity of subsequent 'recovery' sleep. Multiple sleep abnormalities are associated with Alzheimer's Disease (AD) Dementia and Lewy Body Dementia (LBD).
View Article and Find Full Text PDFSci Rep
January 2025
Institute for Electric Light Sources, School of Information Science and Technology, Fudan University, Shanghai, 200438, China.
Sleep disorders constitute a significant disruption for shift workers. Beyond medical interventions, phototherapy is recognized as an effective approach to significantly alleviate sleep disorders, particularly among individuals engaged in shift work. However, the effective dose and efficacy evaluation of phototherapy have not yet been determined.
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