Most people do not think of coffee as a drug. But, in fact, it is a drug and it has important effects on your body. Some of the effects are good and some are not. Coffee can help you stay awake when you are driving or working. But it can also keep you awake at night when you want to sleep. Coffee makes some people feel more alive coffee. After a large meal, coffee can help your stomach. But too much coffee can cause a stomachache.