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The present research clarifies hypersomnia diagnoses in bipolar disorder by exploring possible subgroups and their relationship to prospective sleep data and relapse into mood episodes.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"S0033291714002918_sec_a2\" sec-type=\"methods\">\n                    <jats:title>Method.<\/jats:title>\n                    <jats:p>A community sample of 159 adults (aged 18\u201370 years) with bipolar spectrum diagnoses, euthymic at study entry, was included. Self-report inventories and clinician-administered interviews determined features of hypersomnia. Participants completed sleep diaries and wore wrist actigraphs at home to obtain prospective sleep data. Approximately 7 months later, psychiatric status was reassessed. Factor analysis and latent profile analysis explored empirical groupings within hypersomnia diagnoses.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"S0033291714002918_sec_a3\" sec-type=\"results\">\n                    <jats:title>Results.<\/jats:title>\n                    <jats:p>Factor analyses confirmed two separate subtypes of hypersomnia (\u2018long sleep\u2019 and \u2018excessive sleepiness\u2019) that were uncorrelated. Latent profile analyses suggested a four-class solution, with \u2018long sleep\u2019 and \u2018excessive sleepiness\u2019 again representing two separate classes. Prospective sleep data suggested that the sleep of \u2018long sleepers\u2019 is characterized by a long time in bed, not long sleep duration. Longitudinal assessment suggested that \u2018excessive sleepiness\u2019 at baseline predicted mania\/hypomania relapse.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"S0033291714002918_sec_a4\" sec-type=\"conclusion\">\n                    <jats:title>Conclusions.<\/jats:title>\n                    <jats:p>This study is the largest of hypersomnia to include objective sleep measurement, and refines our understanding of classification, characterization and associated morbidity. Hypersomnia appears to be comprised of two separate subgroups: long sleep and excessive sleepiness. Long sleep is characterized primarily by long bedrest duration. Excessive sleepiness is not associated with longer sleep or bedrest, but predicts relapse to mania\/hypomania. Understanding these entities has important research and treatment implications.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1017\/s0033291714002918","type":"journal-article","created":{"date-parts":[[2014,12,17]],"date-time":"2014-12-17T06:51:47Z","timestamp":1418799107000},"page":"1751-1763","source":"Crossref","is-referenced-by-count":74,"title":["Hypersomnia subtypes, sleep and relapse in bipolar disorder"],"prefix":"10.1017","volume":"45","author":[{"given":"K. A.","family":"Kaplan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"E. L.","family":"McGlinchey","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"Soehner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"Gershon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L. 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