One of the most "interesting" times I spent in a jungle hammock was the night we were on a two-night Junior Leaders Training campout not far from Marianna, FL, and a norther blew in. One thing jungle hammocks don't provide is a lot of shelter from very cold blowing wind. It got down to nearly 20F that night.
Being Scouts and full of ingenuity, several of us heated rocks in the campfire, wrapped them in towels and stuck in our sleeping bags. My sleeping bag was a suirplus army mummy bag --- itchy wool liner, nylon shell outside. In the jungle hammock the towel-wrapped rock settled down to the bottom of the hammock's arc, right next to my butt, and charred holes in the towel, and the muimmy bag before it cooled off and left me freezing with a cold rock by my seat.
Parentheticaly, does anybody remember if those things had zippers? I can't remember, but dont remember how I closed it. Seems like the nylon shell had snaps, I don't remember anything about the liner except that it itched and stayed warm.