I've been studying this stuff on and off for about 15 years. I first read the Biggest Secret in the year 2000 - at the time I was enjoying the topics in the book about UFOs. More recently (perhaps the last 5 years), I've ventured into he study of the archons, and the gnostic texts, and also reading the works of Crowley. It's all much more cemented for me that there is indeed an extra dimensional element to the whole 'conspiracy', and that extra dimensional element explains ghosts, ufos, EVP, cryptozoology, the Mandela effect, alien abduction, OOBE, timeslips, and of course - the reptilians.
Whether or not they actually are reptilians isn't cemented - after all they have the ability to shape shift, and not only that they're a 4th dimensional expression into he three dimensional, just as if we were to venture into the 2 dimensional we would look like circles and lines to the inhabitants - they are wearing human bodysuits, and hybridised humans so they can inhabit them. The true nature of these beings is truly unknown.
I have seen the greys personally, so I know from experience that something is 'out there' - after that experience in 2011 and my years of processing it - nothing would surprise me now.