Interestingly enough, I can now distinguish between "tired after meals" and "simply tired". And thank you for posting the question because it made me realize something! I used to be tired most of the time, during the day when I knew that I shouldn't be tired. I thought this was something wrong with me and was asking the doctors about it. They recommended medication (duh). Medication helped a little btw, except now if I don't take it I get Uuber tired... Anyways, when I started Paleo, I immediately felt more energized and no longer felt tired during the day. Because I have been Paleo for so long now, when I do a cheat day and go all out eating whatever I want, I always have the extreme sleepiness feeling right after I finish eating. The feeling like 'everybody leave me alone its sleep time now' even though I had a full nights sleep the night before. So, I now know the tired after meals feeling, and that it isn't normal. As for tired eyes and yawning, I don't know why that happens but I have that in the morning sometimes even if I have had a good nights sleep and eat Paleo, but I am not as familiar with those tired feelings.

I occasionally get "not enough food" tired when I try to go for too big a calorie deficit on my off days. When I get up at noon, I end up eating "breakfast" around 1 in the afternoon and getting jittery and not wanting to do anything. I occasionally get "post-meal" tiredness, but that's more rare and usually overlaps normal tired anyway.