I ate a whole jar of Greek Peppers with some homemade Tacos on my last overnighter of the summer. I had hung on a ridge near 6500' so the night was cold and windy, and I had my SB cinched over my face. Well at some point during the night, there was an emergency evacuation from the rear, and with the SB over my face, I "Dutch Ovened" myself summtin fierce!
As far as my sleep system goes, I change outta my hiking cothes into lite sweat pants and a cotton t-shirt, a synthetic balaclava, and a fur lined aviator's hat with the ear flaps clipped down. If it's going to be really cold (Shug don't laugh, California gets cold in winter... for us) I put on my thermal underroos. I usually wear a clean pair of socks because my feet get really cold, and any sweat will take the heat away. I also will bring my nalgene, with boiling water, to bed if it's really cold and have luke-warm water for breakfast when I wake up.
It's not perfect, but it works for now.