Your metabolism and sleep cycle are interdependent; studies have shown that a lack of quality sleep can lead to overeating and weight gain, which means taking stimulant-based fat burners later in the day can be counterproductive. LeanFire PM™ was engineered to stack with your favorite daytime thermo to help you burn fat overnight, meaning reaching your weight loss goals can happen even more quickly. This formula is stimulant-free, combining the latest innovations in both sleep and fat burning science so you can achieve restful sleep while simultaneously burning calories.