Sleep abnormalities across different clinical stages of Bipolar Disorder: A review of EEG studies.

Sleep abnormalities across different clinical stages of Bipolar Disorder: A review of EEG studies.

Publication date: Jul 29, 2020

Sleep disturbances are highly prevalent across all stages of Bipolar Disorder. Despite a wealth of research on the neurophysiological features of sleep in this population, progress in this field has been slow. We aimed to review the literature on sleep electroencephalography (EEG) studies in Bipolar Disorder, considering sleep architecture and microstructural oscillatory activity. We included a total of 22 studies: six on sleep during manic episodes, seven during depressive episodes, seven in euthymic patients and two in high-risk individuals. The most consistent findings were increased SOL and REM density across all stages of the disorder. Only two studies reported a reduced spindle count during bipolar depression and euthymia, respectively. Although not specific for Bipolar Disorder, SOL and REM density have been repeatedly found to be increased across all stages of illness in this population. Whereas the former reflects a difficulty initiating sleep, the latter can be considered a neurophysiological signature of patients’ overall reduced sleep need, independent of illness stage.

Concepts Keywords
Bipolar Depression Stages illness
Bipolar Disorder Branches of biology
EEG Neuroscience
Electroencephalography Psychiatric diagnosis
Manic Psychiatry
Neurophysiological Bipolar disorder
Oscillatory Activity RTT
REM Neurophysiology
Sleep Sleep disorders
Sleep Architecture Mania
Spindle Insomnia
Electroencephalography

Semantics

Type Source Name
disease MESH Sleep
disease MESH abnormalities
disease MESH Bipolar Disorder
disease MESH Insomnia

Original Article

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