A medicine called Waklert 150mg  contains the psychostimulant armodafinil, which works to increase wakefulness. It is approved for the treatment of shift work sleep disorder, obstructive sleep apnea, or hypopnea syndrome, and narcolepsy. Patients who experience chronic excessive drowsiness as a result of narcolepsy, shift work disorder, or obstructive sleep apnea may benefit most from the use of armodafinil. Patients may not acknowledge sleepiness or drowsiness unless they are specifically asked about it during particular activities, thus prescribers should be aware of this. Armodafinil tablets should only be used to treat excessive sleepiness; they should not be used to treat the underlying blockage that causes obstructive sleep apnea.