I'm a little late on this one (didn't know about the question till I saw a link from The Thread). If you suffer from post-presentation insomnia or other stress symptoms, try taking 100 mg of vitamin B1 that day. It regulates sugar metabolism in the brain, and a surplus can help with just about anything stress-related. That should help with the "waking up several times in the following night" thing. May not fix it fully, but it should help considerably.
Brain chemistry is a complex thing, but it's all fueled by glucose, and a huge percentage of stress is adrenaline-induced glucose starvation in the brain and related parts of the central nervous system.
Don't balance it out in a multivitamin or "B complex" pill, specifically take just some B1. If you take a daily multivitamin with B1 in it, just add a B1 tablet to that to create an "excess". Grocery stores rarely carry it, but drugstores usually do, and vitamin stores always have some, in my experience.
Adrenaline increases oxygen uptake in affected tissues, increasing the burn rate on glucose. Muscle tissue, et al, can get by on other sugars or even burn its own protein content for fuel (that's bad, but works in an emergency) while the liver catches up on converting lipids to glucose, but the brain only eats glucose and can't cannibalize itself. That results in chemical effects that most people call "stress". Low blood sugar or a B1 deficiency can even result in depression symptomology, because of the same factors. The same factors are major players in hangovers (though most of that is just dehydration), so B1 can help with those too (but it works best if you take B1 before you go drinking, instead of waiting till the hangover is in full swing).
B1 deficiency can also cause nightmares, insomnia, and a variety of related phenomena, simply due to "brain starvation".
Don't go over 200 mg / day unless a doctor tells you to. Not dangerous to most people, just useless. It's water soluble, and your kidneys will just eliminate most of it beyond what your brain actually needs. If you really want to flush a bunch of B1 into the sewers (maybe to help aligators with their stress?), just flush some, don't bother filtering it through a system that's obviously designed to handle vitamin Beer more efficiently.
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