How much do you sleep? You can be tired from too little sleep, or too much sleep. What about your diet? What you eat also plays a factor. Make sure you're getting all your nutrients. I feel better with THROTTLE MATRIX everyday, being a graduate student, I have to put in long hours of research late at night and Throttle Matrix keeps my mind focused. Have a look at their site myochem.com. I don’t know what I would do without it.