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Most device batteries display a message that there is a risk of fire if kept under bedding. Therefore, it is advisable to turn it off for your own safety.
2. It puts our health at risk due to emitted radiation
Generally, mobile phones emit radiation due to transmission signal around 900MHz. Owing to this, keeping cell phones close to the head for prolonged periods can lead to headaches, muscle pains, and other complicated health issues.
Although people tend to keep their phones close to them while they sleep for different reasons, it is, however, better to be safe than sorry.
