Edward O Bixler1, Jordan Gaines2, Alexandros N Vgontzas2. 1. Sleep Research and Treatment Center, Dept of Psychiatry, Penn State University College of Medicine, Hershey, PA, USA ebixler@pennstatehealth.psu.edu. 2. Sleep Research and Treatment Center, Dept of Psychiatry, Penn State University College of Medicine, Hershey, PA, USA.