Well, per [1], it increases dopamine, norepinephrine, serotonin, and other chemicals in the brain. It is highly unlikely that it has no effect on one's decision

Well, per [1], it increases dopamine, norepinephrine, serotonin, and other chemicals in the brain. It is highly unlikely that it has no effect on one's decision making (esp. when you take it when you are _not_ very tired). It's more likely that you don't notice the effects, but the effects would likely be measurable. It's the same with caffeine. I'd wager a guess that most people don't think it influences their decision making... And yet it seems it does (e.g. [2]). [1] https://www.sciencedirect.com/topics/medicine-and-dentistry/modafinil https://www.sciencedirect.com/topics/medicine-and-dentistry/... [2] https://www.freethink.com/health/does-caffeine-harm-your-decision-making https://www.freethink.com/health/does-caffeine-harm-your-dec...