I keep trying to convert to a back-sleeper, but I always still sleep on my side. I just can't sleep well on my back. I'd love to sleep that way, especially because it's easier camping, which I do regularly enough. I'll keep trying.
I DO take freaking awesome naps in a hammock (usually camping), and can sleep decently well at night in one, but they're usually too chilly and they make me feel like a bear feeding trough.