You remember those pranks you played at summer camp? Did you ever do the one where you used toilet paper and "wrapped" someone up in their bed? It is so light wieght that they sleep through you doing it. You pass across the top to a friend on the other side and they roll it under the bed to you, then repeat. They can't break out of it in the morning. That whole "united we stand," "three strands braided are stronger than one" thing.
So here's the thought from the "in"side of sane: Do it to my 3 year old. It won't leave any marks on her (thinking of child services, etc.) She won't keep getting out of bed. It's cheap enough, soft enough, strong enough, will dry up tears and tinkling in pants, etc. Hmmm.....