I'm a programmer and my work requires intense mental focus. My goal is to get 8 clean, productive hours of programming per day. I tried this yesterday, and I managed to get only 2:35 hours of clean ...
That is to say, how long before you notice the effects, feel more alert, and so on. I'm assuming it's different for each person, but there must be a range. Also, does it differ for different types ...
Are there any reliable researches defending the regular consumption of coffee at work?