This CGM tracing of a 28-year-old patient with a 15-year history of type 1 diabetes demonstrates the occurrence of hypoglycemia unawareness lasting from 9:00 to 10:30 p.m. This CGM tracing of a 28-year-old patient with a 15-year history of type 1 diabetes demonstrates the occurrence of hypoglycemia unawareness lasting from 9:00 to 10:30 p.m. The patient experiences a 2-hour episode of hypoglycemia unawareness while sleeping from 11:30 p.m. until 2:00 a.m., when he is finally awakened by his CGM alarm and successfully corrects his hypoglycemia. Reprinted with permission from Unger J: Diabetes Management in Primary Care. 2nd ed. Philadelphia, Pa., Lippincott, Williams, and Wilkins, 2012. Jeff Unger Clin Diabetes 2013;31:179-188 ©2013 by American Diabetes Association