# The Hidden Fire Risks of Charging Phones Under Pillows While radiation fears are unfounded, improper charging habits create genuine fire hazards. - **Source:** [Engadget - Technology News & Expert Reviews](https://brifing.si/source/16dd2da6-3eea-4d1e-b34f-45e846cdf037) - **Published:** 2026-11-08 - **Topic:** [technology](https://brifing.si/c/technology) - **Original article:** - **On Brifing:** https://brifing.si/s/ebe99d05-2bc3-486a-ab13-ca1750897b9f ## Radiation Myths vs Reality Common concerns regarding smartphone radiation causing cancer are largely unsupported by scientific evidence. A recent systematic review published in the Environment International Journal found moderate-certainty evidence that radiofrequency exposure does not increase the risk of brain tumors. Users should shift their focus from these unsubstantiated health fears toward tangible physical safety risks. ## Thermal Dynamics of Charging Charging is a thermal process where lithium-ion batteries naturally release heat while drawing power. This energy must dissipate into the surrounding air to maintain safe operating temperatures. When a device is trapped under pillows or blankets, airflow is restricted, causing heat to accumulate rapidly and potentially damaging internal hardware components. ## Accelerated Battery Degradation Repeated exposure to trapped heat significantly accelerates the breakdown of battery cells, leading to diminished performance. Users who frequently charge devices in bed may notice their phone holding less charge over time. This practice effectively speed-runs the natural aging process of the battery, forcing premature degradation of the device's power capacity. ## The Risk of Thermal Runaway In rare but documented cases, excessive heat can trigger thermal runaway, a dangerous state where the battery generates heat faster than it can dissipate. This condition creates a high risk of fire or severe burns. Using uncertified chargers that lack proper heat regulation or surge protection further exacerbates these critical safety hazards. ## Hardware and Safety Shutdowns Beyond fire risks, trapped heat can warp delicate internal components and trigger automatic safety shutdowns to prevent catastrophic failure. Persistent overheating increases the likelihood of permanent hardware damage, rendering the device unreliable. Protecting your phone requires ensuring that it remains in a well-ventilated environment throughout the entire duration of the charging cycle. ## Optimal Charging Practices To mitigate these risks, always place your smartphone on a hard, flat, and well-ventilated surface while charging. A bedside table or a desk provides the necessary airflow to keep the battery cool. If you lack furniture, placing the device on a hard floor is significantly safer than keeping it under your pillow. ## Equipment and Habit Changes Utilize certified chargers to ensure proper heat regulation and surge protection features are active. Consider investing in a wireless charging pad to create a designated, safe nap spot for your device. Switching to a traditional alarm clock can also reduce the temptation to keep your phone near your head while sleeping. ## Prioritizing Physical Safety While the convenience of keeping a phone nearby is understandable, the potential for fire and battery failure necessitates a change in nightly habits. These simple adjustments require minimal effort but effectively protect your home and device. Prioritizing physical safety over proximity ensures a secure charging environment without sacrificing the utility of your smartphone. ## Sources covering this story - https://www.engadget.com/2309290/why-charging-phone-under-pillow-dangerous-explained/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._