Like "I have also felt that way, particularly after taking insulin, symlin and eating breakfast or dinner. I was recently diagnosed with sleep apnea, and am using a CPAP. My daytime sleepiness is much improved. So many factors can contribute to this...Blood sugar levels, sleep issues, B12 levels,thyroid, iron levels. I'm sure you know this, but discuss with your doctor and rule out the various possible causes. No fun being tired all the time!"