75 to 78 degrees is the ideal environment for bread to rise. If the room is cooler you may want to consider moving the dough outside if it is warm or placing it next to the fireplace or heating unit.
You can also set up a makeshift proofing station by running your oven at 200 degrees with a pan of water in the bottom to create some humidity and the perfect environment for letting your bread rise.
After letting your oven warm up to 200 degrees for two minutes go ahead and turn it off. Place your bowl of dough in the oven with the pan of water still inside and then walk away. Do NOT, do not, open the oven during your rising time. You want to keep all that warm humid air inside.