Popular nootropic Artvigil 150, which contains Armodafinil, is usually given to treat sleep disorders such as obstructive sleep apnea, shift work sleep disorder, and narcolepsy. For obstructive sleep apnea and narcolepsy, a single 150 mg tablet should be used once daily, ideally in the morning. It is recommended that people with shift work disorder take the tablet one to two hours prior to the start of their work shift.