Narcolepsy, sleep apnea, and shift work sleep disorder are among the diseases for which Modvigil, a brand of Modafinil, is used as a wakefulness-promoting drug. Although the onset might vary based on factors including metabolism, food consumption, and individual sensitivity, Modvigil usually begins to function 30 to 60 minutes after oral ingestion. The entire impact may take up to two hours for some individuals, while others experience improved mental clarity and alertness sooner. Modvigil improves wakefulness, attention, and concentration without causing the jitteriness that comes with stimulants. In order to prevent sleep problems, it is advised to take it in the morning. The effects typically last 10 to 12 hours.