Just as a quick follow-up to this post, … there seems to be a narcolepsy drug that works really well for periods when you need a lot of concentration.
The drug name is provigil. The article is a pretty hard-core testimonial on its effect. There’s an interesting discussion here. The article seems to mention no negative side effects (other than making you eat less!) but in the discussion some people mention serious stuff like : “nervousness, insomnia, excitation, irritability, tremors, dizziness and headaches“.