Proofing bread in your home kitchen can require creativity when you're also trying to, say, cook a week's worth of dinners on your day off so the kids don't get rickets from too many PBJs. Since bread dough has to remain protected from drafts and nestled in a warm and moist environment, it usually makes sense to cover the dough with plastic and put it in the baking oven with the light left on to create heat.
If you own a single oven, this ties your hands in the hours that bread is proofing, and also leaves the question: where does this bread go when I'm ready to pre-heat the oven to bake it?
Answer: The microwave. (Just don't actually turn it on!)