Trial results for a study investigating a sleep intervention to target emotion regulation in Depression were posted on ClinicalTrials.gov on 2025-10-15. The study, which enrolled 51 participants, found a significant reduction in amygdala reactivity to conscious fear, with a p-value of 0.008.
Background
Unhealthy sleep patterns are understood to contribute to depressive symptoms by disrupting brain networks involved in emotional regulation. There has been a recognized need to understand how the emotion regulation brain network is modified by sleep restoration and whether such modification mediates reductions in depressive symptoms. This study aimed to test the efficacy of an established sleep intervention, Cognitive Behavioral Therapy for Insomnia (CBT-I), in reducing depressive symptoms by targeting these neural mechanisms.
Trial design
This completed study, designated as Phase NA, enrolled 51 participants to investigate conditions including Insomnia and Depression. The intervention tested was Cognitive Behavioral Therapy for Insomnia (CBT-I), an established sleep intervention. The trial aimed to assess the degree to which this sleep intervention modifies emotion regulation brain networks and its effect on depressive symptoms.
Key results
The study measured changes in amygdala activation during facial expressions of emotion tasks using functional magnetic resonance imaging. For the "Change in Amygdala Activation During the Facial Expressions of Emotion Task (Conscious Condition)", the following mean changes in beta weights (arbitrary units) were observed:
- Pre-treatment amygdala activation was 0.11 (Standard Deviation 0.32), with a subsequent change of -0.18 (Standard Deviation 0.34).
- Another pre-treatment amygdala activation was 0.22 (Standard Deviation 0.60), with a subsequent change of -0.25 (Standard Deviation 0.63).
- A further pre-treatment amygdala activation was 0.11 (Standard Deviation 0.36), with a subsequent change of -0.07 (Standard Deviation 0.40).
For the "Change in Amygdala Activation During the Facial Expressions of Emotion Task (Nonconscious Condition)", the following mean changes in beta weights (arbitrary units) were observed:
- Pre-treatment amygdala activation was -0.01 (Standard Deviation 0.24), with a subsequent change of -0.01 (Standard Deviation 0.35).
- Another pre-treatment amygdala activation was 0.009 (Standard Deviation 0.41), with a subsequent change of -0.01 (Standard Deviation 0.58).
- A further pre-treatment amygdala activation was 0.02 (Standard Deviation 0.22), with a subsequent change of 0.001 (Standard Deviation 0.30).
Mixed Models Analysis was performed to test the effect of treatment-time on amygdala reactivity, including age and sex as covariates. Key findings include:
- Analysis of Conscious Fear > Neutral amygdala reactivity yielded a p-value of 0.008.
- Analysis of Conscious Threat > Neutral amygdala reactivity yielded a p-value of 0.08.
- Analysis of Conscious Anger > Neutral amygdala reactivity yielded a p-value of 0.49.
- Analysis of Nonconscious Fear > Neutral amygdala reactivity yielded a p-value of 0.99.
- Analysis of Nonconscious Threat > Neutral amygdala reactivity yielded a p-value of 0.99.
- Analysis of Emotion Regulation Scenes task Negative > Neutral amygdala reactivity yielded a p-value of 0.65.
What this means
The trial results suggest that the sleep intervention, Cognitive Behavioral Therapy for Insomnia, significantly impacts amygdala reactivity to conscious fear in individuals with depression, as indicated by a p-value of 0.008. This finding supports the hypothesis that improving sleep can modify neural targets within the emotion regulation brain network, potentially contributing to reductions in depressive symptoms. However, similar significant effects were not observed for conscious threat or anger, nor for any nonconscious emotional stimuli, suggesting a specific impact on conscious fear processing.
Source
The information regarding these trial results was obtained from ClinicalTrials.gov, a public database of clinical studies. The results for the study NCT04424407, titled "A Novel Use of a Sleep Intervention to Target the Emotion Regulation Brain Network to Treat Depression and Anxiety", were posted on 2025-10-15 on clinicaltrials.gov.