D_Malik comments on Post ridiculous munchkin ideas! - Less Wrong
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Keep a spray bottle full of water. Set up a reminder to make you spray yourself with the water every 30 minutes. This might boost alertness through the mammalian diving reflex. I have halfheartedly tried this, and it definitely does temporarily boost alertness, but I don't know how long the effect lasts or whether tolerance develops. I'm slightly concerned that it could damage electronics.
(the study from the wiki article)
Very interesting details. You can easily cool your face by combining the spray bottle with a small desk fan, one of which I already have. It looks pretty critical that you also hold your breath while you do it. I think I will try this.