Growing up my parents rarely cooked in crock pots, and when they did, it was always when we'd be home for the duration of the cooking. My general rule is that no appliances (certainly no heating appliances) get left on when I leave the house or go to sleep...but lots of people seem to think nothing of letting the crock pot cook all day while they are at work! Is anyone else afraid to do this? Am I being silly? Does everyone else leave crock pots and ovens at low temps on while they sleep or leave the house?