Wow, I love the range of opinions so far

Looks like I might have also been unclear in my use of "bivy" - I meant a tarp suspended over a sleeping bag, like in AsanaCycles' pics. Not tightly wrapped - I see the sweat problem there.
Not sure about bugs...there are definitely insects around, but it's hard to picture how much of a problem they'll be in the middle of the night. Not much in the way of stinging/venemous ones, anyway.
More comments?