In the testing literature, the term load testing is usually defined as the process of exercising the system under test by feeding it the largest tasks it can operate with. Load testing is sometimes called volume testing, or longevity/endurance testing.
Keep your taste buds awake, drink an energy drink. This may raise your level of alertness for a reasonable amount of driving time. Suck or munch on an apple, orange, or even a lemon to keep taste buds awake. The more tangy the food item the better. (Pull over somewhere safe before eating anything that you can't just pop in your mouth, however.
Under the Brain's Control. At a Glance. Staying awake and alert or sleeping restfully when we choose to depends largely on the function of a few small areas of the brain. When the alerting areas of the brain are most active, they inhibit activity in other areas of the brain responsible for promoting sleep. This inhibition of sleep results in stable wakefulness.