Thought Provigil Effects Similar to Caffeine, but She was Surprised
“It works in a very select area of the brain called the hypothalamus, which regulates among other things sleep and wakefulness,” Wyatt said. “And because it doesn’t work in widespread areas of the brain, it seems to have a much cleaner side-effect profile, not producing nervousness or tremulousness or shakiness that other stimulants can.”
There are some side effects, including headaches, nausea, infection, possible nervousness, anxiety and insomnia. But patients would see a limited number of those effects at one time, and they are actually less than the effects of caffeine.
Dodds thought that the pill would have effects similar to caffeine, but she was surprised.

