Which came first, depression or insomnia? And why do some people with depression sleep too little and others too much? Research shows sleep and mental health share a complex, two-way relationship, but how do we improve our sleeping habits? And do supplements like melatonin actually help?
Written by Yasemin Nicola Sakay on January 31, 2026 — Fact checked by Jill Seladi-Schulman, Ph.D.
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