I'm not suggesting that it's a good idea- I know that it's not- but I DO leave my electric programmable kiln to fire over-night and shut itself down. I do worry about the possibility of losing my studio, but it's a separate old building, on a property 15 minutes from my home. It just doesn't work for me to stay. Mine is a Bartlett controller and you can program an alarm to go off at a particular temperature. I used to set up a baby-monitor next to the kiln and it would beep when I needed to go check. Great feature.
For the best repeatable results with a finicky glaze, you should watch the cones and shut it off yourself. But remember that the worst gases for your health are those that you cannot smell, at the end of a firing. Especially in a glaze firing if there are metals in your glaze. No matter what kind of ventilation you have, they're still there. Try not to hang out with a firing kiln any more than you absolutely have to.
Your bartlett controller also likely includes a feature that allows you to start your firing on a delay so that you can time it so you are present for the duration of the firing.