DS refuses to be covered up so I went and bought some of the fleecy sleeper suits with the feet. Found a great one that is fleecy on the outside and cotton lined on the inside. He also co-sleeps half of the night (the colder half so that helps). I run a little fan heater while I feed him before he initially goes to bed so that takes the chill out of the air, and then I turn that heater back on when he wakes around the 6:30am-7am mark because we have an early morning feed then prayers and Bible reading before we actually get out of bed so it is toasty warm by then!