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Hypersomnia: an overlooked, but not overestimated, sleep disturbance in bipolar disorder
  1. Katherine A Kaplan,
  2. Rayma Williams
  1. Department of Psychiatry, Stanford University, Stanford, California, USA
  1. Correspondence to Dr Katherine A Kaplan, Stanford University, Stanford, CA 94305-5101, USA; katekate{at}

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ABSTRACT FROM: Steinan MK, Scott J, Lagerberg TV, et al. Sleep problems in bipolar disorders: more than just insomnia. Acta Psychiatr Scand 2016;133:368–77.

What is already known on this topic

Sleep disturbances are common across bipolar spectrum disorders. Reduced need for sleep, insomnia and hypersomnia (excessive sleep or sleepiness) are diagnostic features of illness episodes; these sleep disturbances persist into the interepisode period and are associated with functional impairment and risk for relapse.1 Few studies have investigated subtypes of sleep disturbances within bipolar spectrum disorders, and these have been limited to specific illness states (eg, depression)2 or to specific bipolar subtypes (eg, bipolar I disorder).3

Methods of the study

This cross-sectional study recruited 563 inpatient and outpatient adults with bipolar disorder types I and II (BD I and BD II) across Norway. Two semistructured clinician-administered interviews, the Inventory of Depressive Symptomatology (IDS-C) and Young Mania Rating Scale (YMRS), were used to assess mood state. Sleep disturbance …

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  • Competing interests None declared.

  • Provenance and peer review Commissioned; internally peer reviewed.