Several sleep disorders can lead to persistent daytime sleepiness despite having adequate opportunities for sleep. Narcolepsy, obstructive sleep apnea, and shift work sleep disorder are among the conditions associated with excessive sleepiness. Artvigil 250 mg may be used under medical supervision to promote wakefulness in these situations. Treatment should also address the underlying sleep disorder whenever appropriate. Discussing symptoms, sleep patterns, existing treatments, and other medicines with a doctor is important.