1. From the Sleep Center (K.M., S.K., K.N., T.K.), Department of Clinical Physiology (A.U., F.K., S.I.), Cardiovascular Center (S.I., M.O., T.Y.), Toranomon Hospital, Tokyo, Japan; Toranomon Sleep Clinic (K.M.), Tokyo, Japan; and Cardio-Respiratory Sleep Medicine, Department of Cardiology, Juntendo University School of Medicine, Tokyo, Japan (T.K.).