What chemical makes you dream?

Answer 1

There is no single chemical in the brain that produces dreams. In fact, dream research shows that biochemical neurotransmitters tend to be suppressed during the sleep stages when most dreams take place. (see link below.)

Some chemicals, such as Lysergic acid diethylamide (LSD) and Dimethyltryptamine, otherwise known as DMT, produce hallucinations, which can be similar to dreams. Although DMT is found naturally in the human body, it is normally found only in minute amounts and there is insufficient (if any) evidence to assume it plays any role in natural dreaming.