Level 3 sleep studies are used when we suspect you might suffer from sleep apnea. These are done in your own home, wearing a device that records your breathing activity, oxygen levels and heart rate.

 

Level 2 sleep studies can be done at home, too. The devices record brain and muscle activity, in addition to your breathing, oxygen levels and heart rate. We recommend these when you have poor sleep but it’s not clear why.

 

Level 1 sleep studies are similar to level 2 studies, except they are performed in a lab, where you are monitored by a technologist. To have this, you need a referral from your doctor.