Even without personal experience of it - not "even" a regular WILD without these special effects - I find it very logical, that there are so many reports of a phenomenon like this.
You lie awake in your bed - you transit into a dream while still being awake - so what do you expect as direct transit - maybe that is easiest for your brain to conjure up?
Or else maybe something incubated ..
And where from would I form a body, when there is already one there?
And why not by climbing out with a body, which feels a little bit less substantial - but on the other hand very realistic.
Wouldn´t your own body as a matrix to spawn your imaginary, your dream-body from - be the obvious choice?
Making it realistic from the get-go?
So - this has a name and is common - add in mysticism - and then it is called AP (Astral Projectio n) - and there ends rationality, in my view.
It is possible to split the body-scheme of people by "tricking the brain" while they are fully awake by the way.
OBE is a bit like UFO - they are per se not loaded - but unfortunately secondarily.
There are many unidentified things and beings flying about in plain reality - so - why not call them that.
Alien spacecraft is loaded though - and funnily enough not even falling under UFO by means of identification.
Either it is one - which I unluckily not expect - or people think it´s one.
So I also go about it by guessing, what somebody in some context might mean with either OBE or UFO - and ask, if I want to be sure ..