I've caved and bought the teens an electric blanket each. They both spend a long time in their rooms on their beds and so my thinking was that when the weather turns cold they could have the blankets on.
At the moment they have hot water bottles if they feel the need.
So, my worries are if they keep them on all the time, if they forget to turn then off when they go to school, that it'll be horrifically expensive and that finally that they'll electrocute themselves.
Anyone else have teens with on the bed, under the sheet electric blankets reassure me on any or all of those points before I take the things out of hiding and hand them over.