Apple has warned iPhone users not to sleep next to their devices

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.”