Neurotransmitters 

Serotonin promotes

Positive outlook, emotional flexibility, self-confidence, and sense of humor

Melatonin (made from Serotonin) promotes

8 hours of deep, restful sleep

Catecholamines promote

Alertness, energy, mental focus, drive, enthusiasm, concentration

GABA Promotes

Calmness, relaxation, stress tolerance

Endorphins promote

Psychological and physical pain relief, pleasure, reward, loving feelings