Carbs making me sleepy

I have discovered that starchy carbs make me sleepy. I just had pizza and I'm working here at my desk and could so easily fall off to sleep. Like seriously can barely keep my eyes open. I know, go to the doc. But I am just finding it to definitely be carbs so was wondering if anyone else experiences this, if it's associated with diabetes or something like that. I will get checked but not right this sec, I'm working and it's slow, so just figured I ask.