What question did this study set out to answer?

To investigate alterations in sleep signatures in individuals with major depressive disorder (MDD) compared to controls.

February 13, 2026Open Access

Neural Sleep Signatures in Major Depressive Disorder: Altered Oscillatory and Aperiodic Components

Key Points

To investigate alterations in sleep signatures in individuals with major depressive disorder (MDD) compared to controls.
Analyzed polysomnographic data from patients with MDD and controls.
Focused on slow oscillation-spindle coupling and spectral slope during NREM and REM sleep.
Compared spindle density between MDD patients and control subjects.
MDD patients exhibited significantly reduced slow oscillation-spindle coupling.
A flattened spectral slope was observed in MDD patients during sleep.
No differences in standard polysomnographic parameters were found between groups.

Abstract

Patients with MDD exhibited significantly reduced SO-spindle coupling and a flattened spectral slope across NREM and REM sleep compared to controls. MDD patients showed a reduced spindle density. Standard polysomnographic parameters did not differ between the groups in the current sample DISCUSSION: : This study provides the first evidence that MDD is characterized by reduced slow oscillation-spindle coupling and a flattened spectral slope during sleep. These alterations suggest attenuated thalamocortical coordination and may represent a mechanistic link between sleep physiology and clinical symptoms.

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Cite This Study

Mikutta et al. (Sun,) studied this question.

synapsesocial.com/papers/698ebeb185a1ff6a93015fb8 https://doi.org/https://doi.org/10.1016/j.neuroimage.2026.121788

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