 The Canadian Medical Association Journal also reports that modafinil is used by astronauts on long-term missions aboard the International Space Station.Modafinil is "available to crew to optimize performance while fatigued" and helps with the disruptions in circadian rhythms and with the reduced quality of sleep astronauts experience.Modafinil is contraindicated in people with known hypersensitivity to modafinil, armodafinil, or inactive ingredients.