<prompt> Dawn phenomenon refers to:Early morning hypoglycemiaNon-ketotic hyperglycemiaPre breakfast hyperglycemiaRecurrent hypoglycemia  <response>: A more common cause of pre breakfast hyperglycemia is the waning of the evening or bedtime insulin andor the dawn phenomenon. That is, reduced tissue sensitivity to insulin between 5am and 8am dawn, due to spikes of growth hormone released hours before, at onset of sleep. For hyperglycemia due to waning of overnight basal insulin andor dawn phenomenon, an increase in the evening dose of the basal insulin or shifting it from dinneime to bedtime or both can be effective. Ref: German M.S. 2011. Chapter 17. Pancreatic Hormones and Diabetes Mellitus. In D.G. Gardner, D. Shoback Eds, Greenspans Basic Clinical Endocrinology, 9e. 