Unless you are taking Modvigil expressly for a shift work sleep problem and your employment requires you to be awake at night, it is typically not advised to use Modvigil at night. Modvigil (https://www.smartfinil.net/product/modvigil-200/) encourages alertness and has a 12-hour half-life; if taken too late in the day, it may result in sleeplessness. It works well for the majority of individuals in the morning or an hour before a night shift. If you use Modvigil at night without a good medical reason, it might throw off your sleep schedule and make you feel exhausted the next day.