There is no special preparation needed. For example, you should eat your usual evening meal before coming for the test. Be sure you have the phone number of the sleep lab so you can call them if you have any questions. Arrive on time. Do not cancel your test.
Sleep disorders can be serious.
Your doctor requires the results to treat your sleep problem. These tests are costly in time and expertise. Some labs require at least 48 hours notification, or they will charge you for missed appointments. If it is a large facility, make sure you have directions to the sleep lab. Often, after 9 p.m., the receptionists have left for the day.