For many people, going to bed with a smartphone has become part of their nightly routine. Some use it to watch videos, scroll through social media, listen to music or set an alarm before falling asleep. However, one habit that experts strongly discourage is charging your phone under your pillow. Although it may seem convenient, […]

For many people, going to bed with a smartphone has become part of their nightly routine. Some use it to watch videos, scroll through social media, listen to music or set an alarm before falling asleep. However, one habit that experts strongly discourage is charging your phone under your pillow.

Although it may seem convenient, placing a charging phone under a pillow or blanket can create serious safety risks that many people do not realise.

Your Phone Produces Heat While Charging

Every smartphone generates heat during charging.

Under normal conditions, this heat escapes into the surrounding air without causing any problems. However, when the phone is placed under a pillow, mattress or thick blanket, the heat becomes trapped.

Without proper ventilation, the temperature of the phone and its battery can rise significantly.

Most modern smartphones are designed with safety features to reduce overheating, but no electronic device is completely immune to problems if heat cannot escape.

Increased Risk of Fire

One of the biggest dangers is the risk of fire.

Pillows, blankets and mattresses are made from materials that can burn under the right conditions. If a phone overheats because it is covered for several hours, there is a greater chance that the battery or charger could malfunction.

Although such incidents are rare, they have been reported in different parts of the world, particularly where damaged chargers or counterfeit charging accessories were involved.

Battery Damage

Excessive heat is one of the main enemies of lithium-ion batteries, which are used in most smartphones.

Repeated exposure to high temperatures can:

Reduce battery lifespan.
Cause faster battery deterioration.
Increase the likelihood of battery swelling.
Lead to poor charging performance.

Keeping your phone cool while charging helps preserve its battery for longer.

Burns and Injuries

Sleeping with a charging phone under your pillow also increases the risk of burns.

If the phone becomes unusually hot, the heat can transfer through the pillow to your skin, especially if you sleep directly above it.

In extreme cases, overheating batteries can leak or fail, posing additional safety hazards.

Using Fake Chargers Makes It Worse

Many phone-related accidents involve low-quality charging accessories.

Cheap counterfeit chargers often lack important safety features that regulate electrical current and prevent overheating.

For maximum safety, use:

Original chargers supplied by the manufacturer.
Certified replacement chargers from reputable brands.

Avoid purchasing extremely cheap charging cables and adapters from unknown sources.

Charging Overnight Isn’t Always Necessary

Many people leave their phones charging throughout the night.

Most modern smartphones stop charging automatically once the battery reaches 100%, reducing the risk of overcharging.

However, keeping the phone under a pillow for several hours still prevents heat from escaping, which remains a concern.

If possible, charge your phone before bedtime or place it on a bedside table where air can circulate freely.

Other Risks of Sleeping With Your Phone

Beyond charging safety, keeping your phone close to your pillow can also affect sleep quality.

Notifications, vibrations and screen light may interrupt your sleep, while late-night scrolling can delay the production of melatonin, the hormone that helps regulate sleep.

Many sleep experts recommend keeping phones at least an arm’s length away while sleeping.

Safe Charging Tips

To reduce the risk of overheating and other problems:

Charge your phone on a hard, flat surface.
Avoid placing it on pillows, beds or sofas while charging.
Use original or certified chargers.
Replace damaged charging cables immediately.
Remove thick phone cases if your device becomes unusually hot while charging.
Keep charging areas well ventilated.
Unplug faulty chargers that become excessively hot.
When Should You Be Concerned?

Stop using your phone immediately if you notice:

A swollen battery.
Unusual overheating.
A burning smell.
Smoke.
Strange noises during charging.

If any of these occur, disconnect the charger safely and have the device inspected or replaced by an authorised repair centre.

Final Thoughts

Charging your phone under your pillow may seem harmless, but it can trap heat, damage the battery and, in rare cases, increase the risk of fire or burns.

A simple change—placing your phone on a bedside table or another hard surface while charging—can greatly improve both your safety and the lifespan of your device.

Your smartphone is an important part of your daily life, but charging it safely is just as important as using it wisely.