Sleep Services of America has been providing sleep diagnostic services since 1983. It offers services throughout several states. Combined, SSA annually performs more than 26,000 diagnostic studies for adults and children. It offers patients and physicians a complete one-stop-shop for diagnosing and treating sleep disorders. Sleep Services of America is jointly owned by New Jersey-based Vital Signs and Johns Hopkins Medicine, located in Baltimore. The company operates sleep diagnostic centers in Maryland, New York, Oklahoma and North Carolina. Sleep Services of America s headquarters is in Glen Burnie, Md.