The same with dryers. I never leave mine on when I go to bed or when I leave the house. 30 years ago,I had a Sears dryer that had recently been fixed. We went to bed with the dryer running
. It was supposed to turn itself off, but did not. When we woke up in the morning the house was on fire. We made it out alive, but the firemen were surprised and said we would not have lastede 10 more minutes in the house.