Down comforter (real down) and flannel sheets. If you are still cold, wear a nightcap. I don't try to wear socks anymore in bed, I was always taking them off in my sleep when I got too hot and then I had to hunt for them in the morning.

I'm a proponent of light down sweaters indoors. You will never notice wearing them because they are weightless and you can turn your thermostat down 5 degrees if you do.