There are lots of neurochemical stimulants that impact dreaming because they can activate switches in regions of the brain. For example Ketamine is known for it's impact on dreaming and dream recall except Ketamine is also linked to substance-induced nightmares.

Galantamine is another dream stimulant as it treats cognitive decline in memory for Alzheimer's patients. The side-effect is dream recall while using it except.

However, chemically stimulating the brain for dream short-cuts don't really help with a long-term strategy of dream development and can actually be very problematic in the long-term.

For example, melatonin is a sleep aid that also helps promote dreaming, but the sad fact is if we take it as a supplement over time our brain won't produce melatonin naturally creating a supplement dependency that declines with it's investment over time.

The other area that people don't address and I make clear is substance-induced nightmares often can result in using stimulants for dreaming so not recommended. Dream steroids are no different than body-building steroids in my opinion for the short-term gains, long-term consequences so I don't promote them.

Just learning how to dream and getting repeat stimulation of the neural pathways firing naturally without being chemically stimulated to do so actually promotes the development that gives the long-term foundation many natural dreamers enjoy.

The more we practice, the more the brain will adapt neural-pathways to accommodate any skill. Dreams are no different and the evidence is in all the research and in the participants results.