Car TalkDriving TipsEverything You Need To Know About Sleeping In Car With Engine On

Everything You Need To Know About Sleeping In Car With Engine On

One might desire to drive the favorite vehicle for a long time. But, sleeping in car with engine on would not be a wise decision at all.

Let us talk about the reasons that make sleeping inside the car dangerous for you!

Is It Safe To Sleep In A Car?

Sleeping in a car can be safe under certain conditions, but it also depends on various factors. Here are some things to consider.

Location

The safety of sleeping in a car depends on where you park it. If you park in a well-lit and busy area, it is generally safer than parking in a secluded or poorly lit area.

Weather

Sleeping in a car during extreme weather conditions can be dangerous. If the temperature drops too low, you may be at risk of hypothermia. Similarly, if it’s too hot, you may be at risk of dehydration and heatstroke.

Security

Make sure your car is locked and secure when sleeping in it. If possible, use window shades or curtains to block anyone from seeing inside. You can also consider using an alarm system or parking in a secure area.

Comfort

Sleeping in a car can be uncomfortable, especially if you’re tall or have a lot of luggage. Make sure you have enough space to stretch out and that your sleeping arrangements are safe and stable.

Overall, while it is generally safe to sleep in a car, it’s important to consider the factors mentioned above and take steps to ensure your safety and comfort.

Why Sleeping In Car With Engine On Is Not A Good Idea?

A person might feel tired and require a short nap while going through those long drives. The car chamber gets filled with various dangerous gases when a person sleeps inside the car. It is not a wise decision to take short or long naps in any of the vehicles at any cost.

Sleeping in the car with AC on is even more hazardous to the person sleeping inside because it might feel suffocation after a certain period. Numerous possible reasons make sleeping inside the car a dangerous decision.

sleeping in the car with engine on
Sleeping in a car can be uncomfortable. (Photo: Shutterstock)

Suffocation due to air exhaust system

One might die of suffocation if the air exhaust system is not working properly. This is because the same air will travel inside the car for long, resulting in suffocation.

The oxygen level decreases rapidly while sleeping in the car with the engine on. The chances of a person dying while sleeping increase when there is no way inside for the fresh air.

Read More: Top Tips to Make Your Car More Comfortable Than Ever

Increased level of carbon monoxide

The rising level of carbon monoxide inside the car is one of the primary reasons for deaths. Carbon Monoxide is present in the car exhaust system.

One might not realize the trouble as it is an odorless poisonous gas that causes death in no time. As per the expert driving tips, one should not sleep inside the car because of the mounting levels of carbon monoxide.

Malfunctioned air conditioner system

An AC is one of the chief components of an automobile. However, a malfunctioned or weak AC system may lead to serious dilemmas for sure. It is because the air inside the car cannot be recycled if the AC is not working properly.

One might keep the car windows open for a while to pass the fresh air while sleeping. It will help in recycling or refreshing the cabin air for sure.

sleeping in a car
A malfunctioned or weak AC system may lead to dilemmas while you are sleeping in a car. (Photo: Idntimes.com)

Accidental movement

Falling asleep at the wheel, even while parked, poses a significant risk, particularly if the car is in gear. Involuntary muscle spasms or a simple shift in posture during sleep could cause your foot to press the accelerator.

The consequences could range from property damage to serious injury or even fatalities, not only for yourself but also for others in the vicinity.

Beyond the immediate danger of a collision, accidental movement while sleeping in a car could also result in unexpected and hazardous situations.

The vehicle might roll into traffic if parked on an incline, or it could strike a building or other structure. Always ensuring the car is in park and the parking brake is engaged before falling asleep.

Legal issues

Many municipalities have enacted idling laws to curb air pollution and minimize noise disturbance.

Sleeping in your car with the engine running, especially in residential areas or near businesses, could violate these ordinances and result in fines.

Beyond idling laws, sleeping in your car might also attract the attention of law enforcement for other reasons. Depending on the location and circumstances, it could be construed as loitering, vagrancy, or even trespassing.

You should be aware of local regulations and avoid parking in areas where overnight parking or sleeping in vehicles is prohibited.

Attracting unwanted attention

Sleeping in car with engine on can signal to others that the vehicle is occupied and potentially vulnerable. The illuminated interior and the sound of the engine can make the car a target.

Beyond criminal activity, this car might also draw the attention of law enforcement officials who might suspect illegal activity or be concerned about the well-being of the occupant.

For your safety and peace of mind, avoid attracting unnecessary attention by turning off the engine and remaining discreet when sleeping in your car.

sleep in a car
Be aware of local regulations and avoid attracting unwanted attention. (Photo: NST)

FAQs on Sleeping In Car With Engine On

Does sleeping in a car with the engine on affect the cabin air filter?

Yes. Running the ventilation system for hours pulls in air continuously, potentially clogging or degrading the cabin air filter faster, especially in dusty environments.

What’s the risk of animals nesting near your car’s exhaust during long idle periods?

In rural or forested areas, small animals like rodents might be attracted to the warmth of an idling car and nest near the engine bay or exhaust, risking blockages or even fires.

Why is it riskier to sleep in a modern car with the engine on than people think?

Because of the false sense of safety. Many believe modern cars eliminate CO risks.

But a small malfunction (like a cracked exhaust manifold) or blocked tailpipe (like from snow) can still be deadly, even with a newer vehicle.

Could insurance be affected if something happens while sleeping in a car with the engine running?

In some cases, yes.

Some insurers consider sleeping in the vehicle with the engine on a misuse or negligent behavior, which could complicate a claim if there’s theft, fire, or carbon monoxide poisoning.

The Bottom Line

There you have it! These are the important reasons that make sleeping in car with engine on bad for you.

So, avoid your short or long naps to stay away from troubles that might be coming your way!

Matsumoto Naoki
Matsumoto Naoki
Matsumoto Naoki is a senior car blogger at Car From Japan. With a background in mechanical engineering, including experience as a Mechanical Design Engineer at Subaru Corporation, he offers a unique perspective on automotive innovations. Matsumoto's articles provide clear, DIY-friendly instructions and how-to guides to help you confidently maintain your car and save money on repairs. His approachable writing style makes even complex mechanical topics accessible to everyone.
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