The very common reason why anyone would take a smart drug, is to increase efficiency at work or school. Caffeine is the most widely used stimulant, by far. Usually people prefer caffeine and caffeine is probably the most popular drug in all of history. It results in productivity, being reserved for intellectuals and the business elite for most of the early days in coffee history.
Modafinil is simply the next level of productivity enhancement stimulant. We all know this. The tiredness we start feeling in the afternoon, when we start feeling dull and inactive, it is hard to maintain same amount of energy as it was earlier in the day. That is why people buy modafinil. The main aim of modafinil is to delay the tiredness and stay at the top of your concentration for a long period of time. It will show its effects within one hour after you take it. You will feel energized and awake like you have never felt before. It will make you restless. Your brain will become so active and it will keep on producing new ideas.