Sleep test medical procedures includes both unattended sleep monitoring and attended polysomnography.  Canadian Sleep Consultants is a fully accredited Sleep Medicine Diagnostics Facility under the College of Physicians and Surgeons of Alberta. 

• Level 1 Sleep study (Polysomnography) is done overnight in a Sleep Lab or Hospital. A Level 1 Sleep study is used to help determine the cause of excessive daytime sleepiness and to diagnose various sleep disorders.
  A Level 1 study records your brain waves, heartbeats and breathing as you sleep. It also charts your eye movements, limb movements and oxygen in your blood.
• A Level 3 Sleep study is conducted in your home. The device provided records your oxygen levels, heart rate, airflow, snoring and other parameters while you are asleep.
• Level 4 refers to Sleep Apna Screening with Oximetry, which measures blood oxygen levels; this test may also include measuring heart rate. Level 4 studies is usually used to test for Pediatric Sleep disorders.