I take Modafinil every now and then. It's very powerful and can give me an amazing level of focus.

Even though research suggests that they have little negative long term side effects I do worry about taking them and would prefer a more natural method to get the same result.

Basically it's like this; If I get home from a 10 hour workday almost falling asleep, I can take one pill and suddenly it's like the day starts over again as my focus has returned. At the moment I feel like I need to do it as I have projects I work on in the evening that are important for my career progression.