Waklert 150mg promotes alertness in people with daytime drowsiness or sleeping problems. Armodafinil, a stimulant, treats drowsiness caused by obstructive sleep apnea, narcolepsy, and shift work disorder. For obstructive sleep apnea and narcolepsy, 150 mg or 250 mg should be taken once in the morning. For shift work problem, 150 mg should be taken daily 1 hour before work.