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Can better sleep help with depression?

Last updated: October 15, 2026

Often, yes. Poor sleep and depression feed each other, and research suggests that treating insomnia, for example with CBT-I (cognitive behavioral therapy for insomnia), can also improve depression outcomes. It works alongside depression treatment, not instead of it.

The treatment data

Insomnia is a risk factor for developing depression, and it is the most common symptom left over after depression improves. A review by Franzen and Buysse (2008) notes that both sleep medication added to antidepressants and CBT-I show promise for improving sleep and depression together.

The mechanism

Sleep loss makes the brain's emotional center, the amygdala, more reactive: in a brain-imaging study it responded about 60% more strongly to negative images after a night without sleep (Yoo et al., 2007; Walker, 2017). Regular, sufficient sleep helps keep those reactions in check.

Practical first steps

Keep a consistent schedule, aim for 7–9 hours, avoid alcohol before bed, and keep the room dark and cool. If low mood lasts or gets worse, talk to a doctor or mental-health professional: better sleep supports treatment but does not replace it.

Sources

1. Matthew Walker, Why We Sleep (Scribner, 2017). Why We Sleep: Unlocking the Power of Sleep and Dreams
2. Franzen & Buysse, Dialogues in Clinical Neuroscience, 2008. Sleep disturbances and depression: risk relationships for subsequent depression and therapeutic implications
3. Yoo et al., Current Biology, 2007. The human emotional brain without sleep: a prefrontal amygdala disconnect