I'v been kicking around the idea of getting a quilt and the pea pod is on the shortlist. I don't really understand it's design though. To me is looks like a sleeping bag that wraps around the entire hammock. Seems like the underneath part would function fine just like a quilt. But on top wouldn't the fabric be held away by the opening of the hammock? How does that keep you warm? Also it seems like a design that would not work real well for those that sleep on the diagonal. Is that an accurate assumption? In the winter do you need to add a top quilt to fill the empty top space in the pea pod? Would it be like bringing an entire sleeping bag and a top quilt?