Tired after consuming iron when I have low ferritin symptoms

I have some clear symptoms that I get when I'm low on ferritin. I have a long history of low ferritin (two decades with test results, 3.5 decades with symptoms), so I'm pretty confident in addressing what is going on. When I eat chicken liver twice a week, the symptoms clear up (I don't tolerate most supplements well due to allergies to corn and beef plus an acidity intolerance), supporting my belief that this is my normal issues even when I'm not testing to confirm it. I've never tested as anemic, even when the symptoms are relatively severe and I'm visually pale and freaking out the people around me.

The issue is, when the symptoms are most severe and I eat chicken liver, I get very, very tired / sleepy afterwards for several hours. Like, cannot stay awake. Often actually falling asleep for fifteen minutes helps a lot, and I can even half-listen to meetings while dozing. But until I rest or nap, I'm exhausted.

Does this post-iron exhaustion happen to anyone else? Do you know why?

I'm guessing it's something to do with my body getting busy recovering from low iron stores and doing some kind of rebuilding work, but would appreciate more information if it's available. If you have technical terms that describe this phenomena that I can search for or links to studies or articles on it, that would be awesome!

Thanks for anything you can share! And please also feel free to post if you don't experience this, I'm interested in any data points I can gather