Most sleep studies are generally performed overnight, depending on what type of study your doctor request, you may be required to undergo testing during the daytime hours. For overnight testing, you will need to arrive at the sleep center generally between 8-9 PM and will remain overnight until between 6-7AM the following morning. This is considered an outpatient procedure even though you will be in the facility overnight.
In certain situations, sleep studies will be conducted during the daytime. It may be a continuation of an overnight study into the following day or a daytime recording to accommodate night shift workers. For daytime testing you will need to arrive at the center between 7-8 AM and will remain until 5-6 PM in the evening.