Coffee and a Tea drinker here. When i run out of coffee i drink tea and vise versa. I always got my cupboard full of caffine fixes - Good for gaming keeps ya awake for instance being playing the mmorpg Guildwars, wanted to get my character some Grotto Armor which is one of the best armor you can get in the game - played GW for 18 hrs over the weekend with coffee breaks inbetween, no sleep the occasional munch out but thats it. I wouldn't of done it without caffine.
Oh and i got my grotto armor