I don't have that exact experience. Everyone has dreams where they're winning the super-bowl or running away from bikeys on a Harley Davidson with a hidden force field activated to keep them safe. These involve putting yourself in a different role than your every-day life, but your case sounds different. It seems more focused on adopting another person's life or role rather than you having been changed, or having developed some new and fantastic skill, to fit into a situation.

You strike me as someone who would have to be rather empathetic to have dreams like this — you're good at imagining how someone else feels or how it would be if you were in someone else's shoes.. You also strike me as someone who might make a decent actor somewhere down the line.