Neurotransmitters Involved in Arousal

Norepinephrine	Locus coeruleous (pons)
Acetylcholine	Basal forebrain and reticular formation (in pons and medulla)
Serotonin	Raphe nuclei (pons and medulla)
Histamine	Tuberomammillary nucleus (hypothalamus)
Hypocretin	Hypothalamus