I had pretty intense ego death of ketamine not that long ago or maybe IBE not sure what its called. I think I've had it quite a few times but this was the first time I was cognizant enough to unpack it afterwards. Comes with this feeling of de ja vu, followed by nothing but conciousness, feels like the veil of reality has fallen away, unable to really comprehend the existence of anything apart from my own consciousness, as if nothing ever really existed and this is all there is now trapped in time and space, wasn't a very enjoyable but pretty interesting. I feel allot of OBE's on ketamine stem from that weird feeling of movement you can get from it like being rocked or slowly being elevated and dropped down.