Not me, but MrsC
She had a kiln-full of pottery to fire. We get much cheaper electricity overnight, so she usually stays up (napping on sofa) to supervise kiln, and alter the power settings through the firing.
So, about midnight, she turns the kiln on - power on low, turn on the timer, set the kiln-sitter (cutout that works on wax cones). Goes to sleep on sofa.
About 3 am, wanders out to pottery, turns up the power.
About 6 am, wanders out to pottery, turns up the power . . . thinks, hang on, why is the kiln only warm?
She'd turn the timer dial the wrong way so it only stayed on for an hour or so.
Divvery will cost her another night on the sofa.