The pineal gland may have a role in DMT production by way of nightly copper transport, which could allow INMT, the enzyme which creates DMT, to produce more of it, because copper-glutathione complexes inhibit DMT production.

https://imgur.com/4aI4Mup

http://www.jneurosci.org/content/19/3/1018.short

https://www.sciencedirect.com/science/article/pii/0091305776903440

https://www.sciencedirect.com/science/article/abs/pii/0024320577902326