You've already met your mug-a-day quota, but you're looking for something a little more exciting than water. Pass over the soda (too much added sugar) and the energy drinks (too much caffeine, as well as other jitter-inducing mystery ingredients) and reach instead for a bottle of green tea
, preferably unsweetened. Many brands have about one quarter to one third the amount of caffeine
of a serving of brewed coffee, so they'll nudge you awake without affecting your sleep later on.