Abstract
Sleep deficiency in patients with obstructive sleep apnea (OSA) includes abnormal quality, timing and duration of sleep, and the presence of other comorbid conditions. These include insomnia, circadian misalignment disorders, and periodic limb movements of sleep, among others. The co-occurrence of these conditions with OSA likely plays a role in pathogenesis, clinical presentation, and management of OSA. Considering these conditions and their treatment in evaluating sleep deficiency in OSA may help improve patient outcomes. However, future research is needed to understand the intersection between OSA and these disorders.