Why Provigil 200mg is the Industry StandardThe 200mg tablet is the most researched and widely prescribed strength of modafinil. It is designed to provide a solid 10 to 12 hours of wakefulness.Narcolepsy & Sleep Apnea: Usually taken as a single 200mg dose in the morning.Shift Work Disorder: Taken 1 hour before a shift to ensure the peak concentration of the medication hits right as work begins.