The effects of artvigil usually peak two to four hours after taking it. The majority of people report the biggest increases in alertness, attention, and mental clarity during this time. Whether you take it with meals, your metabolism, and your general tolerance can all affect the precise timing. The effects progressively lessen after the peak, although they might still linger for many hours. It is typically used in the morning to avoid disrupting sleep at night due to its lengthy duration. Timing may feel a little bit earlier or later since each person reacts differently.