It might be useful in this context to distinguish between out-of-body experiences (OBEs) as such and the (purported) phenomenon of entering someone else's body (parakāyapraveśa), which is what some of the references given so far discuss. Granted, the latter may presuppose the former, but they are not the same.

Parakāyapraveśa is of course a major topic of David White's Sinister Yogis, which would be accessible to a non-specialist (though I would recommend reading it together with James Mallinson's critical review).

Martin Gansten