Oh hell yes!
I've been seriously contemplating rigging a hammock up in my room too. They're really the most relaxing way to sleep.
I'd never thought about that rocking/floating side to side feeling being mimicked by hammocks/rocking beds before. Makes a lot of sense though.

In a normal bed, I've been finding more and more that it always feels like I'm restricting blood flow to some area no matter which position I sleep in. The only way is on my back, but it's really hard to sleep like that for me.