The glymphatic system links psychiatric sleep disorders and neurological proteinopathies

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Background For decades, neuroscience and psychiatry have treated psychiatric sleep disorders and structural proteinopathies in silos. Characterizing the glymphatic system, a brain-wide aquaporin-4-dependent clearance network optimal during slow-wave sleep (SWS), offers a promising, integrative pathophysiological framework. This narrative review evaluates neurobiological and clinical evidence linking sleep architectural disruptions to impaired parenchymal clearance. Methods A comprehensive search of PubMed, Scopus, and Web of Science was conducted for peer-reviewed English articles up to 2026. Search terms included “glymphatic system,” “DTI-ALPS,” “sleep architecture,” “neurodegeneration,” and “aquaporin-4.” Selection focused on the relationship between psychiatric sleep disorders and the neurobiological effects of proteinopathies. Results Using Diffusion Tensor Imaging Analysis along the Perivascular Space (DTI-ALPS), recent data suggest that sleep fragmentation in major depression, chronic insomnia, and obstructive sleep apnea is associated with altered paravascular fluid diffusivity. Mechanistically, this impaired fluid movement is hypothesized to facilitate parenchymal beta-amyloid (Aβ), tau (τ), and α-synuclein retention, potentially engaging a neuroinflammatory loop involving microglial activation and astrocytic aquaporin-4 depolarization. Thus, sleep disturbances may serve as candidate upstream contributors to prodromal Alzheimer’s and Parkinson’s diseases. We evaluate novel interventions targeting the glymphatic system, including closed-loop acoustic stimulation, dual orexin receptor antagonists (DORAs), and novel pharmacological agents. Conclusions Transitioning from subjective symptom palliation to the physical and mechanical preservation of macroscopic brain waste clearance represents a novel neuroprotective paradigm. Recognizing sleep architecture as a modifiable, mechanistic determinant of central proteostasis could offer a valuable transdiagnostic strategy to mitigate the trajectory of cognitive decline.