After consumption, Modvigil 200 usually begins to function 30 to 60 minutes later. During this time, modafinil, its active ingredient, starts to increase alertness and encourage wakefulness. Depending on the person, the advantages may extend for up to 12 to 15 hours after taking the dose, with the peak effects often occurring 2 to 4 hours later. The optimum time to take Modvigil 200 is in the morning to prevent disrupting your sleep at night.