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An understudied but common opioid withdrawal symptom is disrupted sleep, reported as both insomnia and daytime sleepiness. Despite the prevalence and severity of sleep disturbances during opioid withdrawal, there is a gap in our understanding of their interactions. The goal of this study was to establish an in-depth, temporal signature of spontaneous oxycodone withdrawal effects on the diurnal composition of discrete sleep stages and the dynamic spectral properties of the electroencephalogram (EEG) signal in male rats. We continuously recorded EEG and electromyography (EMG) signals for 8 d of spontaneous withdrawal after a 14-d escalating-dose oxycodone regimen (0.5\u20138.0 mg\/kg, 2\u00d7d; SC). During withdrawal, there was a profound loss (peaking on days 2\u20133) and gradual return of diurnal structure in sleep, body temperature, and locomotor activity, as well as decreased sleep and wake bout durations dependent on lights on\/off. Withdrawal was associated with significant alterations in the slope of the aperiodic 1\/f component of the EEG power spectrum, an established biomarker of arousal level. Early in withdrawal, NREM exhibited an acute flattening and return to baseline of both low (1\u20134 Hz) and high (15\u201350 Hz) frequency components of the 1\/f spectrum. These findings suggest temporally dependent withdrawal effects on sleep, reflecting the complex way in which the allostatic forces of opioid withdrawal impinge upon sleep and diurnal processes. These foundational data based on continuous tracking of vigilance state, sleep stage composition, and spectral EEG properties provide a detailed construct with which to form and test hypotheses on the mechanisms of opioid-sleep interactions.<\/jats:p>","DOI":"10.1371\/journal.pone.0312794","type":"journal-article","created":{"date-parts":[[2025,1,17]],"date-time":"2025-01-17T20:00:03Z","timestamp":1737144003000},"page":"e0312794","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":2,"title":["Spontaneous oxycodone withdrawal disrupts sleep, diurnal, and electrophysiological dynamics in rats"],"prefix":"10.1371","volume":"20","author":[{"given":"Michael","family":"Gulledge","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William A.","family":"Carlezon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R. 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