if anyone has hammock camped before, you know that the underside can get very cold due to the material, the air, and the temps at night. its best to insulate it with something, and i was wondering if those space blankets (you know the super light weight reflective material that is water proof and radiates heat back to you) could be put under the sleeping bag and work to reduce the cold felt on the underside. or, will it be too thin?