What is the best way to deal with sleepiness at the wheel?

By far the most effective formula is:

• Stop.
• Drink two cups of caffeinated coffee.
• Follow this up immediately with a 15-minute nap. The caffeine kicks in after 15 minutes.

Laboratory tests showed this approach cuts driver accidents by over 90%. You need to take two cups of coffee because the caffeine content of each cup of roadside coffee varies widely, from 35 to 80 milligrams. The strength of taste is not related to caffeine content. Energy drinks, available at service stations, can have 75 milligrams of caffeine in a standard dose.

But dosing up with caffeine is a one-off measure. Do it once if necessary. It is not to be repeated. The next time you feel tired, take a proper break. Stop the journey.