I did some reading about Provigil. That stuff is scary. When used consistently and long term, it disrupts the sleep cycle in ways similar to cocaine addiction. The cognitive and memory enhancement function is lost and memory function decreases below the baseline memory skills that existed prior to the Provigil.

Be very careful with it and use it only for times when there is a serious need to be on top of your game. The long term use symptoms sound similar to the foggy brain common to PCS.