We love our bedroom, but it DOES get cold on cold nights. We have two windows and a door to the outside that let the drafts right in, and after the heat goes down around midnight it can chill down to the mid 50's and we will find ourselves digging down into the mattress for warmth.
To offset this we bought a ceramic heater, but found that dried the air out too much. We recently switched to a really nice Delonghi oil heater and it does the job very nicely. How's your bedroom? (pic: sogonow.com)