CHI Memorial Regional Sleep Center - 1720 Gunbarrel Road, Suite 206, Chattanooga, TN 37421. CHI Memorial Regional Sleep Center - Missionary Ridge Medical Tower, 725 Glenwood Drive, Suite 680, Chattanooga, TN 37404. CHI Memorial Regional Sleep Center - Hixson, 2051 Hamill Road, Hixson, TN 37343. CHI Memorial Regional Sleep Center - Parkway ....