<unk>  <unk>  is a common, potentially serious sleep disorder
Characterized by repetitive collapse of the upper airway leading to intermittent pauses in breathing during sleep
Most common in adult males and postmenopausal women
Risk factors include older age, male gender, obesity, and upper airway abnormalities
Complications include drowsy driving/motor vehicle accidents, neuropsychiatric dysfunction, cardiovascular morbidity, pulmonary hypertension, and right heart failure.
Obstructive sleep apnea
Excessive daytime sleepiness
Sick sinus syndrome
Insufficient sleep - shift work, underlying comorbidity, medication affects
Pulmonary hypertension 
Sleep disorders - circadian rhythm sleep-wake disorder, narcolepsy
Pulmonary hypertension
Sleep related movement disorder - restless legs syndrome, periodic limb movement disorder