Not trying to correct you at all, but we old folk are all talking about candles and walkmen, but time has moved on and now it is tablets and phones and other things that are overheating and not space heaters or coffee pots or crockpots.
The overheated phone was a while ago and I know batteries are better now but still…I wouldn’t have worried about a cell phone doing that until my friend sent me a picture of his (former) mattress all burned.
I’m sure my kids were sleeping with their phones under their pillows (afraid of sleeping through an important call or text) so off went a warning to stop doing that.