Sleep Clinics of District of Columbia  Please let us know about your sleep disorder clinic! (ASDA Cert.) - Certified by the American Sleep Disorders Association. For a current list of members, contact gmader@millcomm.com. DISTRICT OF COLUMBIA Sibley Memorial Hospital Sleep Disorders Center - 202-364-7676 (ASDA Cert.) Other resources: Columbia, Sleep research centers, sleep doctors, sleep clinics |