Abduction Investigator David Jacobs claims in his book "Secret Life" that some perceived OBE's are actual physical abductions where experiencers feel themselves floated through walls and into waiting craft by a technology beyond our comprehension. Experiencer author Betty Luca Andreasson claims, though, that, in many of her abductions, it is truly her spirit that is taken and that she has repeatedly met beings in a purely energy form. These energy beings, according to Betty, also employ a stored physical body, when needed.

This leads to ghosts. If certain extraterrestrial species are at a level of advancement to where they can freely exist in either a physical or energy form, then perceiving a being in this form is literally a form of a ghost. Possibly, an example of this is the "shadow being." These beings, who resemble three-dimensional shadows, have been reported inside the homes of some experiencers. Another angle on the ghost theory, as well, is the occasional report of certain extraterrestrials disguising themselves as deceased loved-ones to experiencers in an effort to calm them.

All of this is just a sampling of the interconnectivity.

Bigfoot, psychic phenomena, ghosts, and UFO's - can any of these be accurately classified as independently occurring phenomena (without ultimately some connection to one another)? Don't be surprised if one night you find yourself on a UFO during an OBE, only to find yourself confronted by the ghost of a bigfoot creature, just like the one you dreamt of the previous night. Who's to say it couldn't happen?