Which of the following neurotransmitter is MOST impoant for the induction of REM sleep?

Acetylcholine is the neurotransmitter of primary impoance for the induction of REM sleep. Some of the other neurotransmitters do function in sleep, but REM sleep can occur in their absence. Dopamine is a neurotransmitter with a role in voluntary movement, mood, cognition, and regulation of prolactin release. Epinephrine is impoant in sympathetic nervous system responses. It is also a CNS neurotransmitter. Norepinephrine is impoant in sympathetic nervous system responses. It is also a CNS neurotransmitter involved in attention, arousal, and mood.