Polysomnography

**Definition:** Simultaneous and continuous monitoring of several parameters during sleep to study normal and abnormal sleep. The study includes monitoring of brain waves, to assess sleep stages, and other physiological variables such as breathing, eye movements, and blood oxygen levels which exhibit a disrupted pattern with sleep disturbances.

**Tree numbers:** - E01.370.520.625

**Synonyms:** - Monitoring, Sleep - Somnography