Leaving wet clothes in the washing machine is not a good idea
Doing laundry is always a pain. If you have a demanding job or a family to take care of, the only moment you may have to wash clothes is at night. That means you will have to stay up for at least two more hours. Furthermore, you should make sure to take the wet clothes out and hang them to dry.
It might be tempting to go to bed after you put everything inside the washer, but that would mean that your wet clothes will stay in there until the next morning. That is a sure way to undo all the cleaning you have previously done since they will end up smelling of mildew and some garments can even get ruined forever.