Apple has warned iPhone users not to sleep next to their devices while charging them as it could lead to prolonged heat exposure that causes discomfort or injury.
Why you shouldn’t: The warning comes in the latest version of Apple’s iPhone User Guide. It states that while iPhone and Apple USB power adapters are built to comply with surface temperature limits required by international, regional and applicable country standards, “sustained contact with warm surfaces for long periods of time may cause discomfort or injury.”
“Use common sense to avoid situations where your skin is in contact with a device, its power adapter, or a wireless charger when it’s operating or connected to a power source for long periods of time. For example, don’t sleep on a device, power adapter, or wireless charger, or place them under a blanket, pillow, or your body, when it’s connected to a power source,” the guide states.
iPhone charging recommendations: To prevent discomfort and injury, Apple recommends keeping one’s iPhone, power adapter and any wireless charger in a well-ventilated area when in use or while charging. Furthermore, iPhones should only be plugged in while they are on a flat surface.
Apple also warns against using damaged cables or chargers in environments where they may come into contact with moisture.
Those with physical conditions that affect their ability to detect heat against the body are also advised to “take special care.”