We all know someone who just can't make up their minds or refuses to commit to one thing. In the sleep world, people who don't stick with one position are known as freestylers. They'll try a bit of everything, as long as it gets them to sleep eventually. One night it might be the soldier, another night the log, or the freefall. They'll mix it up until they find the one that's just right for that particular night.
Freestyle sleepers definitely exist, but they are quite rare. Most of us have our set sleep style and stick with it. Not committing to one sleep position doesn't reflect on any kind of commitment issues in real life - that's one thing we know for sure. As for the rest, not a whole lot of research has been done on freestyle personalities, due to the rareness of it.