Related Experiment Video
Updated: Aug 19, 2025
04:33
Author Spotlight: Unveiling the Connection Between Sleep Disorders and Cognitive Symptoms in Depression
Published on: April 26, 2024
763
Non-REM sleep in major depressive disorder
Leonore Bovy1, Frederik D Weber1, Indira Tendolkar1
1Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center.
Neuroimage. Clinical
|December 1, 2022
Summary
Major depressive disorder (MDD) patients exhibit subtle non-REM sleep EEG changes, including altered sleep spindles and slow waves, particularly when medicated. These alterations correlate with impaired procedural memory consolidation.
Area of Science:
- Neuroscience
- Sleep Medicine
- Psychiatry
Background:
- Disturbed sleep, particularly REM sleep alterations, is a hallmark of major depressive disorder (MDD).
- Non-REM sleep alterations and their contribution to cognitive deficits in MDD are less understood.
- Investigating non-REM sleep EEG features is crucial for understanding MDD pathophysiology and cognitive symptoms.
Purpose of the Study:
- To comprehensively analyze non-REM sleep EEG features in MDD patients compared to healthy controls.
- To explore the association between non-REM sleep alterations, depression severity, and procedural memory consolidation.
- To investigate the influence of antidepressant medication on non-REM sleep microstructure.
Main Methods:
- Analysis of non-REM sleep EEG in central channels from three independent datasets (N=284 recordings, 216 participants).
- Exploration of sleep architecture, spectral power, sleep spindles, slow waves (SW), and SW-spindle coupling.
- Assessment of associations with depression severity and overnight procedural memory consolidation, considering medication status and age.
Main Results:
- No significant systematic alterations in overall non-REM sleep architecture were found between MDD patients and controls.
- Unmedicated MDD patients showed higher spindle amplitude; medicated patients exhibited longer SWs, lower SW amplitude, and dispersed SW-spindle coupling.
- Long-term antidepressant medication was associated with reduced spindle density, which correlated with impaired overnight procedural memory consolidation in medicated patients.
Conclusions:
- Non-REM sleep EEG alterations in MDD may be more subtle than previously suggested, particularly concerning sleep microstructure.
- Antidepressant medication appears to influence non-REM sleep features, potentially impacting sleep-dependent memory consolidation.
- Further research is needed to elucidate the complex interplay between MDD, non-REM sleep, cognitive function, and medication effects.
Keywords:
AntidepressantCouplingDepressionEEGMedicationNon-REM sleepProcedural memory consolidationSleep cycleSleep spindlesSlow wavesMore Related Videos
05:59Author Spotlight: Overcoming Challenges in Drosophila Sleep Measurement Using DAM System
Published on: October 20, 2023
2.5K
06:23A Chronic Sleep Fragmentation Model using Vibrating Orbital Rotor to Induce Cognitive Deficit and Anxiety-Like Behavior in Young Wild-Type Mice
Published on: September 22, 2020
5.4K
Related Concept Videos
01:15REM Sleep Behavior Disorder
333
REM Sleep Behavior Disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis that normally occurs during the REM phase of sleep. This absence allows individuals to physically act out their dreams, which are often vivid and disturbing. Common behaviors exhibited during episodes include kicking, punching, and yelling. These actions can be dangerous, potentially leading to injuries for the person with RBD or their bed partner.
RBD is significantly associated with...
RBD is significantly associated with...
333
01:24Sleep-Wake Cycles
1.5K
Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
1.5K
01:23Antidepressant Drugs: MAOIs and Other Agents
301
Atypical antidepressants, including bupropion (Wellbutrin), mirtazapine (Remeron), nefazodone (Serzone), trazodone (Desyrel), and vilazodone (Viibryd), offer unique mechanisms of action. Bupropion weakly inhibits dopamine and norepinephrine reuptake, aiding depression treatment and smoking cessation, with a low risk of sexual dysfunction. Mirtazapine enhances serotonin and norepinephrine neurotransmission, leading to sedation, increased appetite, and weight gain. As a result, it helps treat...
301
01:17Sedatives and Hypnotics Drugs: Miscellaneous Agents
224
Sedatives and hypnotics encompass a wide range of substances, each with its unique mechanism of action, uses, and potential adverse effects.
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
224
01:19Management of Insomnia
306
The sleep cycle, an integral part of human health, consists of several stages with distinct characteristics and functions. It begins with a transition from wakefulness to sleep, known as the light sleep phase, followed by the restorative deep sleep phase, essential for physical recovery and growth. The cycle concludes with the Rapid Eye Movement (REM) phase, characterized by high brain activity and vivid dreaming. Insomnia, a prevalent sleep disorder, involves difficulty falling asleep, staying...
306
01:27Depressive Disorders: MDD and Dysthymia
195
Depressive disorders are a group of mental health conditions characterized by pervasive feelings of sadness, diminished pleasure in life, and a significant impact on daily functioning. These conditions are most prevalent in individuals during their 30s and affect women at twice the rate of men. Contrary to popular belief, younger individuals are generally more susceptible to these disorders than older adults. Two key types of depressive disorders include Major Depressive Disorder (MDD) and...
195