Parents have long experimented with various methods to lull their infants to sleep, but one of the most reliable tricks remains the humble car ride.

A recent poll conducted by Family Car Deals reveals that over a third of parents frequently drive around to help their children drift off. Anecdotal evidence supports this, with one Reddit user noting that their six-month-old can’t last six miles in the car without falling asleep. But what is it about the gentle hum of a car that works like a charm on overtired babies?

Harrison Walsh, Head of Procurement at Family Car Deals and a family motoring expert, explains that the soothing effects of a car ride are rooted in science. “It’s believed that certain qualities of a car ride can make babies feel like they’re still in the womb, making them feel secure enough to nod off with ease.”

Here are the three key reasons why a car ride works wonders:

Cars mimic the rocking motion of the womb

The movement of a car is akin to the gentle rocking an infant experiences in the womb. Studies suggest this motion helps regulate a baby’s central, motor, and cardiac systems, inducing calmness and making sleep more likely. The brain responds to this movement on a primal level, lowering heart rates and creating a feeling of safety.

The car’s environment is calming and distraction-free

Unlike a room filled with toys and noise, the interior of a car offers minimal stimulation. With the warmth, insulation, and darkness, it’s easy for babies to relax and fall asleep in the comforting, distraction-free environment.

The engine noise acts as a form of white noise

White noise has been shown to be an effective sleep aid for people of all ages, and the hum of a car’s engine is no different. Whether it’s the low rumble of a petrol engine or the softer sound of an electric motor, the noise creates a consistent background that helps babies focus while drowning out other potentially disruptive sounds.

Practical tips for getting your child to sleep in the car

For parents looking to make the most of their driving time, Family Car Deals has shared some helpful advice on how to ensure your child sleeps soundly during car journeys.

• Recreate their home sleep environment. Bringing along comfort items such as blankets or stuffed toys can make a big difference. Replicating elements of their usual sleep setup provides familiarity, helping them associate the car with relaxation and sleep.
• Block out light where possible. If you’re travelling at night, consider using window shades to block out external light. Exposure to light can interfere with melatonin production, a hormone that regulates sleep. Keeping the environment as dark as possible will help your child sleep more deeply.
• Time your journey with their nap schedule. One of the simplest ways to ensure your child sleeps in the car is to plan trips around their natural sleep patterns. Travelling during their usual nap times, or at night when they’re already tired, can make it easier for them to settle.
• Stick to their bedtime routine. If you’re driving in the evening, following your child’s typical pre-sleep routine can signal that it’s time to rest. Whether it’s a bath, a bedtime story, or a bottle, these cues can help them wind down, even in the car.

Family Car Deals conducted a survey of 2,000 parents, with 36% admitting they use the car as a sleep tool for their children. For more tips and advice, visit Family Car Deals.