Yes, the same thing happens to me too, the fact is that when you eat the body sends a lot of blood to the stomach to make digestion and you are in a state of fatigue and what you want is to rest the food, I think it is the reason for this situation.Well, I really do not know why, but I always feel tired after having a meal and i do not feel like I should work after having a meal. I think that heavy meals make us really lazy.