We are always accompanied by mobile phones. Mobile phone has ditched wrist watch and that’s why we have to rely on them (phones) whenever we need to know time.
Our body faces a continuous attack of radiations coming from the towers of network providers. These radiations are dangerous and we can’t avoid them.
But we must at least take steps to reduce their quantity.
So, it’s a better idea turning our phone off before going to sleep.
Mobile phone should be kept away from our bed. For setting an alarm, we should use some clock.