After ingesting modafinil, including brands like Modvigil 200, you usually remain awake for 12 to 15 hours. For those with narcolepsy, sleep apnea, or shift work sleep disorder, its stimulating effects can increase alertness and decrease drowsiness. Although Modvigil 200 aids in waking, its duration may differ according on a person's metabolism, dose, and reaction. While it can help avoid drowsiness, it doesn't offer the healing effects of sleep. It may disrupt your nighttime sleep if you take it too late in the day. Using modafinil sensibly and under a doctor's supervision is crucial.