A medicine that promotes wakefulness is modafinil. Narcolepsy, hypersomnia, sleep apnea, and shift work sleep disorder are all conditions it is used to treat. Off-label, modafinil is frequently used to improve cognition. Modafinil has a longer duration of action than other medications. Modafinil has a half-life of 12 to 15 hours, although several factors, such as genetic predispositions, and...