You are on a long, familiar road. At some point you realise you have no recollection of the last several miles. You must have steered, kept your distance, perhaps changed lanes. You simply were not there for it.
Almost every driver has had the experience. It has a name: highway hypnosis.
Where the name came from
The idea is about a century old. A 1921 article described “road hypnotism”: driving in a trance-like state while staring at a fixed point. In 1929 the psychologist Walter Miles wrote about motorists who seemed able to sleep with their eyes open and keep steering.
In the 1950s the notion became popular as an explanation for otherwise puzzling crashes on the new long, straight motorways. The term highway hypnosis itself was coined by G. W. Williams in 1963.
It is sometimes called white line fever, or driving without awareness.
What is actually happening
Despite the name, it is not hypnosis in the clinical sense. Nobody has given a suggestion, and the driver has not chosen to enter a focused state.
It is an example of automaticity: the ability to carry out a well-practised skill without conscious attention. The same thing lets you ride a bicycle, type, or walk down stairs while thinking about something else.
Driving a familiar route makes few demands. The practised part of your mind handles the steering and speed, while your attention drifts to daydreams, music or plans. Because you were not attending to the drive, you laid down no memory of it.
Researchers have found that the key factor is not so much monotonous scenery as predictability. When the brain can anticipate what is coming, it stops paying close attention.
What it has in common with hypnosis
A little.
- Narrowed, absorbed attention
- Reduced awareness of surroundings
- Lost time
- A sense that actions happened by themselves
This is why hypnotherapists often mention it when explaining what hypnosis feels like: “You have already been in a similar state, driving home on autopilot.” It is a fair comparison for the feeling of absorption. It is not the same thing.
Is it dangerous?
It depends on what it shades into.
Automatic driving with an alert mind is not especially dangerous. Experienced drivers do much of their driving this way, and they usually snap back if something unexpected happens.
Drowsy driving is very dangerous. Fatigue slows reactions, narrows attention, and leads to microsleeps: lapses of a few seconds during which you are effectively unconscious. At motorway speed, a car covers a long distance in that time.
The trouble is that the two blur into each other. A monotonous road at night, a warm car and a tired driver produce both. What feels like “zoning out” may be the start of falling asleep.
Warning signs of fatigue
- Yawning, heavy eyelids, rubbing your eyes
- Difficulty keeping your head up
- Drifting within or out of your lane
- Hitting the rumble strip
- Missing a sign or an exit
- Not remembering the last few miles
- Varying speed without meaning to
- Wandering, disconnected thoughts
If you notice these, you are not safe to continue.
What works
The only real remedy for tiredness is sleep.
- Stop somewhere safe as soon as you can. Not the hard shoulder.
- Take a short nap of fifteen to twenty minutes.
- Have a caffeinated drink before the nap. It takes about twenty minutes to act, so the two combine.
- Swap drivers if you can.
What does not work
- Opening the window
- Turning up the radio
- Cold air on your face
- Slapping your cheeks
- Willpower
These give a brief lift at best, and may leave you feeling more alert than you are.
Preventing it
- Sleep properly the night before a long drive.
- Avoid driving at the times your body expects to sleep: the small hours and mid-afternoon.
- Take a break at least every two hours.
- Share the driving.
- Avoid alcohol, and check whether any medication causes drowsiness.
- Do not start a long journey after a full day’s work.
- Keep the car cool.
- Vary the stimulation: conversation, a podcast that needs following, changing your eye focus between near and far.
- Move your eyes. Check the mirrors, scan the road ahead, read the signs.
If you are regularly sleepy at the wheel despite enough time in bed, see your doctor. Sleep apnoea is a common, treatable cause.
A rule about relaxation recordings
Never listen to a hypnosis, relaxation or sleep recording while driving. They are designed to reduce alertness and narrow attention, which is the last thing a driver needs. The same goes for practising self-hypnosis. Do it when you have arrived.
What it shows about attention
Highway hypnosis is a daily demonstration of something that surprises people about hypnosis itself: we can carry out complex, skilled behaviour with little conscious involvement, and experience it as happening by itself. The mind does not have one single stream of attention. It can run a practised task in the background while awareness goes elsewhere.
That is ordinary, not mysterious. It is also why absorption, whether in a film, a book or a suggestion, can change what we notice and remember.
The bottom line
Highway hypnosis is driving on autopilot: a well-practised skill running without your full attention. It is normal, and it is a good everyday illustration of absorbed attention. The danger lies in mistaking drowsiness for it. If you cannot remember the last few miles and your eyes are heavy, pull over and sleep.
Next in the series: Can Hypnosis Make You Commit a Crime?
This article is for general information. It is not a substitute for road safety guidance in your country.