>>20670951lb
Hard-working anon, if you're still reading, go pick up some rhodiola rosea tincture at a natural foods or health food store (or buy online). Don't take any within 3 hours of when you need to sleep. It's an herbal tincture which, just a few drops, will give you sustained mental focus and physical energy.
Better than caffeine. I use it on long road trips when I'll be driving more than 6 hours. It prevents that "road hypnosis" effect when your focus get narrowed to just the road in front of you (or the taillights in front at night).