You need more insulation on a hammock, so add that too.
Remember bridges freeze first.
The upside is of course that they are cooler in hot weather, the kind of weather they were originally made for like the West Indies.

But comfort is comfort so a few ounces or a pound or so does not make up for that.
In my case, I can't sleep at night on a hammock, I can for an afternoon nap but that is it.