I've got to second using a Buff for sleeping. I often use two of the synthetic ones: one for my eyes/head, and one for the lower half of my face. I can adjust the lower one as needed throughout the night, and the top one helps me sleep better for some reason; sure blocks the stars though.
Buffs also do a bang-up job covering the face while moving, and while it's difficult to keep breathing through them once they're loaded with moisture, they do a great job helping me keep my breath warm before I'm moving and my body heat is doing the rest.
All that said, I'm looking at getting a down balaclava for the really cold temps too; I've got a 0 degree quilt that I don't use much because my head always gets too cold, even with a a synthetic hood from my parka, a fleece, and 2 buffs wrapped around it.
This is about the cheapest down-filled one that I've seen on the internet: http://lukesultralite.com/content/crazy-warm-down-hood . I think it even has more down in it than the zpacks one, though it is, consequently, heavier.