«Polysomnography, known as a sleep study, is a test used to diagnose sleep disorders»: https://www.mayoclinic.org/tests-procedures/polysomnography/about/pac-20394877 «Polysomnography is considered to be the gold standard for diagnosing sleep-related breathing disorders. This included «obstructive sleep apnea (OSA), central sleep apnea, and sleep-related hypoventilation/hypoxia» https://www.sciencedirect.com/topics/psychology/polysomnography What does it mean to have apnea? «Apnea: This is when you stop breathing …