If your kitchen is on the cooler or draftier side, you can place your dough on a warm appliance (I go for the counter above my turned-on dishwasher, washing machine, dryer, or refrigerator) or on a windowsill that gets warm sunlight. You can also pre-heat your oven to the lowest temperature, usually about 200°F, shut it off, then place the covered bowl in it to rise. Be sure to remember to turn the oven off while proofing in there.