First understand I toss and turn in the night. I sleep on my sides, back, front and then toss and turn again in a normal bed.

I think it depends on the hammock and how you hang it.
I have an Eagle's nest Hammock. I find I sleep best when the hammock is strung tight.
In it I tend to sleep on my sides and back. I don't see how anyone can sleep on their front in that hammock. It would bend you in the wrong direction.
To be honest, side sleeping in a hammock is easier than on the ground or even in a regular bed. In a regular bed or on the ground my knees are hitting together. In a hammock my knees are offset a little.


The biggest problem I have with a hammock is using it around civilized people in civilized parks. I never could change cloths without standing up outside the hammock. In many parks hanging from the trees would get you kicked out (or just finding two trees that you could hang from would be a problem). You also have to leave your gear on the ground underneath you. I never cared for this in snake country.

Then there are the other hammocks. I can only sleep on my back in a back yard hammock. I could never get comfortable on my side and I always felt like I was falling out. The tent in the trees hammock is a different animal. I have very little experience with the design.