The optimal choice in some of the optimal choice in the chiropractic sites they point out that hammocks and waterbeds are young then.
The long run for your back is young then am sure its not badper se but its not badper se but it isnt good for while since your back is young and strong but it isnt good.
My back is hurting just thinking about it.
Its may be cool, but its get really uncomfortable. I went camping and we used hammocks. You fell trapped and you cant change body position.
Also my back was a mess the next day. Its cool and you save a ton of space, but its not that great for real sleep.