The recommended initial dose for the treatment of obstructive sleep apnea (OSA) & narcolepsy is 150 mg taken in the morning. This dosage is similar if treating shift work sleep disorder (SWSD), but it is taken an hour before the start of the shift. If treating other health conditions, follow the prescription. For improving cognitive function or productivity, take it an hour before indulging in the act. Make sure to kick off early such that armodafinil effects take control of what you are aiming to achieve. The half-life of Artvigil is around 12–15 hours. Only one dose is taken per day to avoid overstimulation in the evening when it’s time to go to sleep.