Six to seven foot tall praying mantis like entities are a common element in many alien abduction accounts. They're typically in the background, silently watching the proceedings while letting the little greys carry out the examinations.
In "DMT: The Spirit Molecule" author Rick Strassman theorises that DMT enables the brain to tune in to other parallel realities beyond "channel-normal". If the interdimensional hypothesis for alien abductions is correct, perhaps DMT allows one to occasionally tune into the source of this mysterious phenomenon.