V Z.
If you don't have time to/don't want to take a quick nap, what helps me is watching either motivational videos or (as weird as it is) what wakes me up almost every time is watching something funny like stand up comedy. After watching it work for a while and if you're getting tired again, watch something short again. Another thing would be doing some quick exercises to wake up or dance around to some fun music. Good luck!
