What is Level 2 Sleep Study ? A Level 2 sleep study is a specific type of sleep assessment used to diagnose sleep disorders. It typically involves more comprehensive monitoring than a Level 3 or home sleep apnea test but is less extensive than a Level 1 study conducted in a sleep lab. Here’s a breakdown of what a Level 2 sleep study usually entails: Monitoring Parameters: Brain Activity: Electroencephalography (EEG) to track brain waves and determine sleep stages. Eye Movements: Electrooculography (EOG) to detect REM sleep and differentiate between sleep stages. Muscle Activity: Electromyography (EMG) to assess muscle tone, especially in the chin and legs. Heart Rate: Electrocardiography (ECG) to monitor heart rhythm and rate. Breathing Patterns: Sensors measure airflow, respiratory effort, and oxygen levels in the blood to identify breathing-related disorders like obstructive sleep apnea. Setting: In-Lab Setting: A Level 2 study is often conducted in a sleep clinic or sleep center, where specialized equipment is used to monitor various physiological parameters during sleep. Purpose: Diagnosis: It helps diagnose sleep disorders such as obstructive sleep apnea, central sleep apnea, narcolepsy, and parasomnias (e.g., sleepwalking). Evaluation: It provides detailed information about sleep architecture and disturbances. Comparison to Other Levels: Level 1: The most comprehensive study, typically done in a sleep lab with a full range of monitoring equipment. Level 3: Often used for home sleep apnea testing, focusing primarily on airflow and oxygen levels with less detailed monitoring compared to Level 2. Level 4: Generally used for simpler or more limited monitoring, such as just tracking oxygen levels. The choice of study level depends on the specific clinical needs and the suspected sleep disorder.