MIRROR: Download from MEGA
As already said in replies, heat build up is the problem. With saran it should be a tad less than for leather and rubber. (I have experience of putting submissives in the later ones. But to regulate things I leave some part of the body free. (There's even one image of it on my profile on Fetlife - where the legs are free.)
Then it all depend on the individual, where some have no problem whatsoever. Others will need water now and then, to compensate for said sweating.
Now one thing were not addressed here, and that is skin breathing. Yes we do get most trough our lungs, but the body do also need some via the skin as well. And really tight materials like latex, rubber and wrapping (Not leather, its ok at least most kinds of leather.) of this kind can shut it down.
So I agree on that she should be at hand monitoring the first time it is done, on a later time she might get some light sleep while you got a tube connected to a small bottle of water attached.
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