Sleepiness after taking Modvigil 200mg is unusual, although it might occur. Individual body chemistry, tolerance, poor sleep quality, and drug interactions are all possible explanations. If you are sleep deprived, your body may reject the drug's effects, resulting in weariness. Some people may also metabolize modafinil too rapidly or too slowly, which reduces its efficacy. In rare circumstances, underlying medical conditions such as hypothyroidism or chronic weariness may interfere. Furthermore, counterfeit or low-quality copies of Modvigil may have diminished efficacy. If drowsiness continues after taking Modvigil 200, visit a doctor to discuss dose, quality, or alternative therapies.