If you are feeling extra tired and are experiencing lower energy levels you may want to choose a lighter roast since they typically contain
more caffeine per cup.
Even decaf drinkers should beware: A 2007 Consumer Reports study found that «decaffeinated» coffees sold at several chain restaurants varied widely, containing up to 32 milligrams
of caffeine per cup — about the same amount in 12 ounces of cola.
Various types of tea can contain as little as 15 mg of
caffeine per cup to as much as 75 mg of caffeine per cup.
A matcha latte contains 80 mg of
caffeine per cup.