Sleep-related complaints are second only to complaints of pain as a cause to seek medical attention. We classify sleep disorders into six major categories based on the International Classification of Sleep Disorders: Insomnias, Sleep-Related Breathing Disorders, Hypersomnias, Circadian Rhythm Sleep-Wake Disorders, Parasomnias and Sleep-Related Movement Disorders. We’ll also cover how sleep disorders are diagnosed.  Learn more in our archive of guides listed below.