It is the most common type of sleep disordered breathing sdb and is characterized by recurrent episodes of upper airway ua collapse du. The objective of this health technology policy assessment was to evaluate the clinical utility and cost effectiveness of sleep studies in ontario. Polysomnography For The Sleep Technologist Instrumentation Polysomnography is used to diagnose or rule out many types of sleep disorders including narcolepsy idiopathic hypersomnia periodic limb movement disorder plmd rem behavior disorder parasomnias and sleep apnea although it is not directly useful in diagnosing circadian rhythm sleep disorders it may be used to rule out other sleep disorders. Obstructive sleep apnea polysomnography . This is video 1 of 2. Obstructive sleep apnea occurs when the muscles in the back of your throat relax too much to allow normal breathing. Polysomnography in patients with obstructive sleep apnea. This sleep study can also help rule out other sleep disorders tha...