A polysomnogram is a study that measures the quality of your sleep. A polysomnogram is also called a sleep study. Sleep studies are usually conducted in Sleep Labs. The studies are often carried out during the night so that normal sleep patterns can be reproduced. Each study will be somewhat unique to the individual depending upon each patient and their circumstances. A typical sleep study includes monitoring the following: If you think you have Sleep Apnea, the best thing to do is have a study done.