REM parameters in drug-free major depressive disorder: A systematic review and meta-analysis

Summary & key facts

The authors combined results from many studies that measured REM sleep in people with major depressive disorder who were not taking psychiatric drugs. They found that, compared with people without depression, those with depression tended to enter REM sleep sooner, spent a larger share of the night in REM sleep, and often showed faster eye movements during REM. The pattern was common across studies but not the same for everyone, and the review does not prove that REM changes cause depression or can be used by themselves to diagnose it.

Key facts:

• The paper is a systematic review and meta-analysis, which means the authors gathered and combined results from many studies that measured REM sleep in drug-free people with major depression and in healthy comparison groups.
• On average, people with major depression showed a shorter REM latency, which means they reached their first REM period sooner after falling asleep than people without depression.
• People with depression also spent a larger percentage of the sleep period in REM sleep, so REM made up more of their night on average.
• REM density, the speed or frequency of eye movements during REM sleep, tended to be higher in depressed people in many of the studies included.
• The review only included people not taking antidepressant or other psychiatric medications, so the findings reflect sleep differences linked to depression itself rather than drug effects.
• There was variation across studies. Factors like age, how severe the depression was, and differences in study methods changed how large the REM differences looked.
• These sleep differences are common in depression but do not prove cause and effect. The results do not mean REM changes can by themselves diagnose depression.

Topics

Anxiety, Depression, Psychometrics, Treatment, Cognitive Processes Mental Health Research Topics Treatment of Major Depression

Categories

Experimental and Cognitive Psychology Psychology Social Sciences

Tags

Clinical psychology Depression (economics) Economics Forest plot Funnel plot Internal medicine Macroeconomics Medicine Meta-analysis Meta-regression Psychology Publication bias

Conditions & symptoms

Depression Sleep disorder Poor sleep Sadness or low mood