Hey zuzu,
Many people mistake "Out of Body Experience" precursors/episodes with that of alien abduction experiences, etc... More often than not, this is due to the fact that they lack an understanding of what "OBEs" truly are/entail, and therefore they will tend to use previously understood notions (i.e. alien abductions) as a way to gainfully add defention to these misunderstood anomolies. That's not to say that alien "visits" do not occur... it's to say that "sometimes" the line between an alien visit/OBE can get very blurry. I recommend checking out "
www.astralpulse.com" to see if your "otherworldly" experiences don't fall under the OBE category...
With regards to lifeforms from other planets... It's been scientifically noted that there are more planets capable of sustaining life within our immediate universe than there are grains of sand on our entire planet alone... If that can create "any" kind of picture as to how LARGE our immediate universe actually is.
One has to truly ponder the myriad possibilities that plausibly exist within the confines of our physical universe... Not to mention, the other dimensions/planes of awareness that tend to escape our localized consciousness...
It's a beautiful universe!
Let's dawn our awareness goggles and go for a swim!

PUL,
Cosmic_Ambitions