What do you do when you're extremely sleepy (and sleeping isn't an option) but you still want to wake up, and feel more alert?

What do you do when you're extremely sleepy (and sleeping isn't an option) but you still want to wake up, and feel more alert?
I'm not crazy, ask my toaster.
Drink or eat something (can be very light), be around a bright light source - the sun is best, and/or any kind of exercise, typing doesn't count.
If I'm at home I brush my teeth because whenever I'm sleepy and wanting to go to sleep I brush my teeth and end up waking myself up.
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