Insomnia causes depression as much as depression causes insomnia: Three surprising points from a fascinating episode of KQED Forum [audio, no transcript] with guest Dr. Michelle Primeau of the Stanford School of Medicine.
Insomnia has long been taught to be a symptom of depression, but in many cases is a cause of depression.
CBT (Cognitive Behavioral Therapy) is an effective treatment for both insomnia and depression.
CBT can be more effective and longer lasting than sleeping pills
For those averse to audio (like me, normally), the NYT also covered the research in print: