I believe:
DMT occurs naturally in the brain and is normally kept in check, rleased during sleep. Some individuals cannot regulate it properly and trip balls while sleeping, thus they experience what is often reported as an alien abduction experience.
The thing making this so fascinating is everyone has a comparable hallucination while under the influence. You can drop acid as much as you want and likely have a different experience each time. Though similar, everyone's personal account of their LSD experience differs when it comes to visuals. But, with DMT, everyone sees the same fucking thing.
How is this possible? I certainly don't believe in insect overlords. But, I am intrigued by the idea all of us can experience an identical psychedelic experience. It hints at something much bigger.
Joe Rogan explains his DMT experience.