Too much sugar in the diet, persistent muscular tension and the stress hormones it produces, and lack of sleep are all problems that impact our ability to think clearly.
Because we grew up in a culture where doctors fix problems with a pill. Too depressed ? - Take Prozac. Can't have sex ? Take Viagra. Can't fall asleep ? Talk to you doctor about Lunesta.
Now it's "can't think", so sure there is a quick fix -- Provigil. Some HN-ers already ordered it, according to their comments on this post. Perhaps, they'll get further ahead of the pack using it. Perhaps their startups will launch faster. Or perhaps they'll suffer from long-term effects of the drug that nobody has studied yet. Who knows...?
I certainly don't want to gamble with my brain. I'd rather accept my mediocrity, struggle with lack of attention, anxiety and other issues, than suffer possible long-term side-effects later.