It is vital that your sleep specialist is aware of any medications that you are taking. This includes both prescription and non-prescription drugs. He or she should even know if you are taking common cold medicines or pain relievers. Certain drugs can affect your sleep and the results of the study. You may need to gradually stop taking some medications in the days leading up to a sleep study. Your doctor will let you know if this is something you need to do. Do not stop taking any prescription medication without first talking to your sleep specialist.