Grayslake The Center for Sleep Medicine Grayslake Outpatient Center Northwestern Lake Forest Hospital - Emergency Center 1475 E. Belvidere Road, Suite 203 Grayslake, Illinois 60030 Phone: (847) 231-4721 Fax: (847) 231-4722 The Center for Sleep Medicine in Grayslake is an accredited member center of the American Academy of Sleep Medicine. Directions to our Grayslake center Written directions to this location