How can I remember to eat?

It probably sounds like a ridiculous question. When you feel hungry, just eat something, right? In my case, that doesn’t work. I rarely feel hunger pains. When I haven’t eaten I just get spacey, get a slight headache, or might not be able to sleep. Yesterday I forgot to eat breakfast and dinner. I was laying in bed last night trying to figure out why I was having such a hard time falling asleep when I realized that I’d skipped two meals. If I’m focused on something or busy I usually don’t notice that I’m hungry.