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.
Pulling over at a rest stop or gas station to get out and stretch for a few minutes about every 100 miles or two hours will help you remain alert. 2. Double up on caffeine. Experts often warn against drinking coffee or soda right before bedtime, but in this case, drink up! The equivalent of two cups of coffee can boost your alertness and focus for several hours. For best results, try drinking a cup of coffee and then taking a 20-minute nap before you leave. 3. Avoid alcohol and medications. Driving while drinking is a big no-no anyway, but certain OTC and prescription meds can impair your judgment in the same way, especially if taken on an empty stomach.
Here's what you need to do: Hold down the sleep/wake button (on older models it's on the top of the phone. On the iPhone 6 series and newer, it's on the right side) until the power-off slider appears on the screen. Let go of the sleep/wake button. Move the power-off slider from left to right.