There are directional signs on interchanges that can help you determine where you need to go. When you feel tired, it is harder to make decisions and to react to the traffic around you. You may fall asleep at the wheel. When you feel sleepy, pull off the highway at the nearest rest stop or service area. If you are really sleepy, take a nap.
Tired drivers are a great danger to themselves and other drivers.
Highway hypnosis is caused by the sameness of the road and traffic. The hum of the wind, tires and engine also adds to the hypnosis. Highway hypnosis can make you feel sleepy and unaware of the traffic around you. You can avoid highway hypnosis by constantly moving your eyes and watching the traffic and highway signs around you. But again, if you feel sleepy, pull off the highway.