I'm super drowsy even though I had some caffeine. I'm drinking lots of water and eating healthy foods, but is there anything else I can do in the meantime?
How do you make yourself feel better after a poor night of sleep?
Edit: It went well! The director even said, "we should just hire you now!" However, I have one more panel interview. Time for a nap.
The holy trinity of mental clarity is to take a hike, a shower, and then a nap, cyclically in that order. Best advice that ever reached me. I explain it here, but basically it's like companion planting: hikes get energy flowing and help with exposure, showers/hydration get rid of impurities and inspire epiphanies (I guess the mists do this), and sleep allows your mind to rest but also wander with all of that. If you can't do one, do the other two (caffeine is not good for people, that "wakefulness" is just a high).
Or you could always be like Satoshi Tajiri during his interviews and wing it based on 24 hours of no sleep (he would help with making games for 24 hours and sleep for 12 and repeat the cycle, he even had his bed at the Gamefreak HQ for a time, and one time the BBC or whatever caught him during the end of the 24 and was like "is this a bad time").