@SooperSarah Radiation. And it doesn't feel right to have it on when I'm "offline" and sleeping.
There's discussions whether it's dangerous or not and I rather be safe than sorry, it doesn't hurt me and I like that I control my device and not the other way around.
Here's one sleep physician who claims it's dangerous. One of many. But he focus mainly on the router radiation.
@Queendragonfly you're surrounded by wifi signals regardless of your phone's wifi setting. There were experts that said 5g was going to kill us all too. Each 'expert' needs to be taken with a grain of salt.