>>2679965aye.
but not when it's wet.
so either height of summer or height of winter (below freezing).
I've done it a few times in summer and biggest issue was midges.
so I'd recommend a bivvy bag with a built in bug net if you can afford it.
personally haven't had issues with condensation but think i got lucky with low moisture/humidity- and i run hot, my excessive body heat dried things.
hoping to try a winter summit bivvy camp soon.