John Karstens, DO, is a sleep medicine specialist with the AHN Medicine Institute. He enjoys working with patients to develop individualized care plans that improve their sleep and their overall quality of life. Dr. Karstens specializes in sleep study interpretation and treatment of sleep disordered breathing. He is also interested in the central disorders of hypersomnolence and insomnia. He received his medical degree from the New York Institute of Technology College of Osteopathic Medicine, in Jonesboro, Arkansas. His residency in internal medicine was done at Stony Brook Southampton Hospital, in Southampton, New York. He completed a fellowship in sleep medicine at Geisinger Health System in Wilkes-Barre, Pennsylvania. Dr. Karstens is certified by the American Board of Internal Medicine and the American Board of Allergy and Immunology. He is a member of the American Academy of Sleep Medicine and of the American College of Chest Physicians. Dr. Karstens sees patients ages 13 and older.