Vilafinil is one of the most used medications to treat sleep disorders. Vilafinil contains brand version Modafinil. Modafinil is the most used medication to treat sleep disorders. Vilafinil keeps you awake during working time or a day. Vilafinil is the most used medication in the USA, UK, Australia, etc. Vilafinil 200 (Modafinil) is the most effective and most used dose.