Thats a myth that you obe every night while you sleep.
I can stay consciousness through all sleep levels, also checked with my own eeg machine.
Even in delta sleep, deep sleep you are not out of your body!
If you go under deep sleep, to a near death experience then my experience is you
get what ppl call a obe. A real one!

My own experience from real life and not from books are the same as the practise of the yogi
of the far east and of ppl that had a near death experience.
And that is that what ppl call a obe happens below deep sleep.
Many ppl that think they have a obe is still rem sleep level.
They see a body double in bed and say then oh this is an obe.
Or they say wow this is so real that it must be a obe.
I let some ppl do tests that had obes, at least they thought that.
And after testing they admitted it where clever disquised dreams.
Sort of special lds.

The ppl that had a near death experience, are changed for the rest of there life.
you dont see that with fake obes.

The far east yogi is very diciplined when it comes to consciousness and there experiences
speak of the fact a real obe comes from under deep sleep stage.
The near death excidents tell the same and i who can also stay conscious through all sleep
levels also tell the same.
You dont obe at normal sleep, ppl are not out of there body automatically.
If so, like with a near death experience you would have full conscious and u would remember.

I can describe all sleep stages from consciousness and in rem stage and deep sleep stage
your still inside of your body.