I've got the Patagonia down hoodie "sweater". It only has a 1/2 zipper, but it works pretty well. I love sleeping in it. The combination of the hood and my sleeping bag's hood keeps me toasty warm.
I had to choose between hood with 1/2 zip vs. no hood with full zip. I choose hood. I've been happy for the most part but of course would rather have a full zip.
In "middling" weather where it's not all that cold, I can't really vent the sweater properly. When I'm in my sleeping bag (which does have a full zip), It's not as much of a problem because I can use the sleeping bag's zipper to vent.
HJ
