Ok, so I am not exactly sure it is a Nootropic, but it definitely has to do with a drug used for brain enhancement, so I am posting it in this forum area. Here is a link to an article about a sleeping pill (Zolpidem) that can, according to a study, temporarily revive people in a "permanent" vegetative state to the point where they can have conversations.
One of the patients mentioned had been in a vegetative state for three years (showing no response to touch, unable to talk, etc), but after taking Zolpidem was able to talk to his family and answer questions.
I thought it was quite interesting...