It explains one type of OBE... or at the very least emulates it. There is no "proof" here that this is in any way the sole explanation. (and maybe they didn't claim such, I'll admit to merely scanning the article.)

I used to have a nightmare dream that spiders were hanging over my bed and descending onto my face. I later came to realize that this was my brain "interpreting" attempts to contact me by astral projection... something I am apparently not willing to allow.

How do I know this? Someone who claims to be adept at astral projection once tried to contact me one night when I was visiting. The next morning his wife commented on how I must have had a nightmare because I woke her with my scream. He said no... that was me just rejecting his attempt to contact me.

And I had had the spider dream. (None of this was prediscussed. I didn't know he ever projected, it had never come up, I didn't know he intended to contact me.)

It all came together. Now the visits no longer bother me, though I still do not allow them in. But I do believe in astral projection. I believe in OBE's though I'm not a practioner.

And as a side note, with my usual need to project humor, I only practice IBE's... if she's cute.