I experienced lows after eating like V because I have gastroparesis. Endo said the telling symptom is lows after eating followed by highs hours later when the insulin is gone. I inject after meals & switched to Humulin Regular because it works slower & lasts longer. I also have rapid acting to correct highs.
I tested every hour after eating for five hours to learn when the spikes happened. This meant I was testing almost every hour on the hour for days.
Having gastroparesis makes things unpredictable. Usually, gastroparesis is worse in the evening. My endo wasn’t sure if my fasting highs were due to food was digesting when sleeping, or dawn phenonmenon. I was told not to eat for at least 5 hours before bed, to eat a light dinner & to space meals by 4-5 hours.