We've just bought one for our 6 year old daughter. We use it for 10 minutes to warm the bed before she hops in, then turn it off. We've explained the fire danger to her and trust her not to fiddle with it. It's also on a surge protection power point, etc. We used to use a wheat bag until reading about all the fires caused by those. For our child, in our circumstances, a good quality electric blanket used responsibly is the safest option.