If you become drowsy while driving, recognize that you are in danger of falling asleep and pull over. Coffee or another type of caffeine drink can promote short-term alertness, if needed. Just be aware that it takes about 30 minutes for caffeine to enter the bloodstream.
Caffeine is also available in soft drinks, chewing gum and tablets. Caffeine and a nap together offer short-term benefits. Keep in mind that caffeine won’t have much of an effect on people who consume it regularly.