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Sleep in Bipolar Disorder: A Systematic Review and Meta-Analysis of Case-Control Drug-Free Patients
Giuseppe Barbato1, Barbara Tondi1, Dario Morra1
1Dipartimento di Psicologia, Università della Campania "Luigi Vanvitelli", 81100 Caserta, Italy.
Brain Sciences
|July 28, 2026
Summary
Bipolar disorder significantly alters sleep patterns, with reduced total sleep time and efficiency in both manic and depressive states. Depressive phases show decreased delta sleep, while manic phases exhibit increased REM activity, impacting mood regulation.
Area of Science:
- Neuroscience
- Psychiatry
- Sleep Medicine
Background:
- Bipolar disorder is characterized by significant mood fluctuations.
- Sleep disturbances are a common and often prominent symptom in bipolar disorder.
- Understanding polysomnographic sleep parameters is crucial for characterizing bipolar disorder subtypes and phases.
Purpose of the Study:
- To conduct a systematic review and meta-analysis of polysomnographic sleep parameters in bipolar disorder.
- To compare sleep patterns between drug-free bipolar patients (manic and depressive phases), healthy controls, and patients with unipolar depression.
- To identify specific sleep alterations that characterize different phases of bipolar disorder.
Main Methods:
- Systematic review of databases from inception to May 2026, identifying 107 studies.
- Meta-analysis of 43 case-control studies involving 670 bipolar patients, 520 healthy controls, and 280 unipolar depression patients.
- Comparison of key sleep parameters including total sleep time, sleep efficiency, REM sleep, and slow-wave sleep (DELTA) using random effects models and Egger's regression for publication bias.
Main Results:
- Reduced total sleep time and sleep efficiency were observed in both manic and depressive bipolar patients compared to healthy controls.
- Depressive bipolar patients showed reduced DELTA sleep time and percentage.
- Manic bipolar patients exhibited decreased stage 2 sleep, reduced REM sleep time, shortened REM latency, and increased REM density.
- Unipolar depression patients had reduced total sleep time and increased REM density compared to bipolar depression patients.
- Drug-treated bipolar patients showed minimal differences from healthy controls, except for altered REM percentage, latency, and density.
Conclusions:
- Sleep alterations are confirmed in bipolar disorder, with distinct patterns for manic and depressive phases.
- Reduced delta sleep characterizes the depressive phase, while increased REM activity is indicative of the manic phase.
- These sleep changes may be linked to underlying monoaminergic and cholinergic activity, potentially influencing mood regulation and illness progression.
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