I'm in the same boat, dude. Slept for three hours yesterday and woke up feeling like death warmed over. Not a great feeling. I don't usually nap. If I feel groggy, I'll have tea or something, or take a short break to watch a YouTube video or something. I find that watching videos or going on the Internet (ie: just staring at a tiny phone screen probably) keeps me from getting too groggy.

Dunno what works for you, but try to walk around a bit for five or so minutes, or do something else. It takes a bit of forceful focus, but it'll pass eventually (and come back full force around 10-ish).

Try not to eat too much for lunch. Take cold showers. Keep yourself moving at a quick pace. Slowing down and ~relaxing will put you right back in bed.