Modvigil (https://www.smartfinil.net/product/modvigil-200/) tapers gradually rather than abruptly "switching off." Most people have visible effects for a total of 10 to 12 hours, peaking for around 6 to 8 hours before steadily declining. However, the medication has a half-life of 12 to 15 hours, which means that little doses stay in your system for a significantly longer period of time and can occasionally interfere with sleep if taken late. As it wears off, you can first experience decreased alertness followed by moderate weariness. How long it lasts depends on a number of factors, including dose, metabolism, sleep quality, and sensitivity. Modvigil wears off before bed if taken early in the morning.