Circadian rhythm sleep-wake disorders: Overview

Mental health clinicians are extremely familiar with the problem of insomnia and, to a lesser extent, with hypersomnia (especially hypersomnia due to obstructive sleep apnea). But, there is another kind of sleep problem that is, in my experience, frequently misdiagnosed as insomnia and inappropriately treated—Delayed Sleep Phase Disorder. As we will see below, that is not…