{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,12]],"date-time":"2026-05-12T19:43:29Z","timestamp":1778615009280,"version":"3.51.4"},"reference-count":78,"publisher":"Public Library of Science (PLoS)","issue":"5","license":[{"start":{"date-parts":[[2021,5,13]],"date-time":"2021-05-13T00:00:00Z","timestamp":1620864000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100005725","name":"CHDI Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100005725","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:p>Sleep disturbance is a common and disruptive symptom of neurodegenerative diseases such as Alzheimer\u2019s and Huntington\u2019s disease (HD). In HD patients, sleep fragmentation appears at an early stage of disease, although features of the earliest sleep abnormalities in presymptomatic HD are not fully established. Here we used novel automated analysis of quantitative electroencephalography to study transitions between wake and non-rapid eye movement sleep in a sheep model of presymptomatic HD. We found that while the number of transitions between sleep and wake were similar in normal and HD sheep, the dynamics of transitions from sleep-to-wake differed markedly between genotypes. Rather than the gradual changes in EEG power that occurs during transitioning from sleep-to-wake in normal sheep, transition into wake was abrupt in HD sheep. Furthermore, transitions to wake in normal sheep were preceded by a significant reduction in slow wave power, whereas in HD sheep this prior reduction in slow wave power was far less pronounced. This suggests an impaired ability to prepare for waking in HD sheep. The abruptness of awakenings may also have potential to disrupt sleep-dependent processes if they are interrupted in an untimely and disjointed manner. We propose that not only could these abnormal dynamics of sleep transitions be useful as an early biomarker of HD, but also that our novel methodology would be useful for studying transition dynamics in other sleep disorders.<\/jats:p>","DOI":"10.1371\/journal.pone.0251767","type":"journal-article","created":{"date-parts":[[2021,5,13]],"date-time":"2021-05-13T17:52:16Z","timestamp":1620928336000},"page":"e0251767","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":19,"title":["Abnormally abrupt transitions from sleep-to-wake in Huntington\u2019s disease sheep (Ovis aries) are revealed by automated analysis of sleep\/wake transition dynamics"],"prefix":"10.1371","volume":"16","author":[{"given":"William T.","family":"Schneider","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Szilvia","family":"Vas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alister U.","family":"Nicol","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0181-6346","authenticated-orcid":true,"given":"A. Jennifer","family":"Morton","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"340","published-online":{"date-parts":[[2021,5,13]]},"reference":[{"key":"pone.0251767.ref001","doi-asserted-by":"crossref","first-page":"347","DOI":"10.1016\/0301-0082(94)00057-O","article-title":"Restoration of brain energy metabolism as the function of sleep","volume":"45","author":"JH Benington","year":"1995","journal-title":"Prog Neurobiol"},{"key":"pone.0251767.ref002","doi-asserted-by":"crossref","first-page":"11517","DOI":"10.1523\/JNEUROSCI.2512-17.2017","article-title":"Enhancing Memory Consolidation through Slow Oscillation and Spindle Synchronization","volume":"37","author":"SY Kim","year":"2017","journal-title":"J Neurosci"},{"key":"pone.0251767.ref003","doi-asserted-by":"crossref","first-page":"948","DOI":"10.1016\/j.cub.2018.01.087","article-title":"Memory Consolidation Is Linked to Spindle-Mediated Information Processing during 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