Use caffeine wisely

Caffeinated beverages can help enhance your performance and mood if used in a strategic way. Keep in mind that you will need 100 milligrams to 200 milligrams of caffeine (the equivalent of a big cup of coffee or several soft drinks) to get the desired results. It takes the stimulant 15 to 30 minutes to take effect, and lasts three to four hours. Just make sure you don't drink it close to bedtime as it can ruin sleep.