It's freezing outside, and with cold weather comes dry air and therefore dry skin. Look it up! Protect that baby's-ass soft skin of yours with a humidifier at night. Your skin is your largest organ, after all. Look that up, too.
You don't need to buy a giant humidifier and take up valuable bedroom space. Instead, you can just get this wee humidifier that turns water from a bottle into sweet, sweet steam. It's less than $20, at least it is if you live in Japan.