Randomized Trialhigh evidence
The impact of timing on bright light therapy: Alleviating anhedonia and circadian rhythm disturbances in depression patients: a randomized controlled trial.
Journal of affective disorders·July 15, 2026·PMID 41785919
Why it mattersAnhedonia is a core symptom of depression that often responds poorly to standard treatments. This study provides evidence that morning bright light therapy can specifically target anhedonia, potentially through circadian realignment, offering a non-pharmacological option for patients with residual anhedonia or circadian disruption.
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