Same. On the rare occasion I get more than about 500 calories at lunch, and i have to be very careful about what I eat or I'm dozy half the afternoon. A salad is fine, or a bowl of ramen or similar if folks happen to be going out somewhere that serves it, but anything heavier than that and I'm going to have a bad time. A nice side effect is that a normal-sized supper generally does make me sleepy, which helps with getting to bed at a reasonable hour.

I can recommend the practice, especially to skinnier folk who would like to stay that way - too late for me, I'm afraid, despite three miles' worth of foot commute daily, but it does wonders for my afternoon productivity nonetheless, and if it doesn't actually help lose weight then it does at least help keep it stable.