Wikileaks has released a new email showing Hillary Clinton inquired about a powerful anti-fatigue drug and was sent information about it by one of her top State Department aides.

It’s not clear why, but on October 25, 2011, senior aide Jake Sullivan — who is now the Clinton campaign’s senior foreign policy advisor — sent the Secretary of State information about Provigil.

“I was wrong that it was invented by the military,” Sullivan writes to Clinton, indicating another conversation was held about the drug outside of the released emails, “but right about military use of/interest in it.”

Sullivan told Clinton Provigil is used “to treat excessive sleepiness caused by narcolepsy or shift work sleep disorder (sleepiness during scheduled waking hours among people who work at night or on rotating shifts). It is also often prescribed to treat excessive sleepiness in patients with Parkinson’s, Alzheimer’s, and multiple sclerosis. Additionally, it has also gained a following among students, truckers, and others who want to stay awake for extended periods of time.”

Sullivan noted the military liked the effects of Provigil.

“The military, for obvious reasons, is interested in the consequences of prolonged sleep deprivation and has tested modafinil heavily, particularly on pilots,” the aide wrote.

A study carried out by the Air Force Research Laboratory found that fatigued pilots on modafinil maintained flight accuracy within approximately 15-30 percent of baseline levels, whereas performance under the no-treatment condition declined by as much as 60-100 percent. Here, benefits were most noticeable after 24-32 hours of continuous wakefulness. A French study yielded similar results and found that for missions of about 24 hours, modafinil for soldiers is preferable to naps.

Is Hillary Clinton taking this drug to stay active on the campaign trail?