Serotonin regulates mood. When the hormone level is normal, the person is happy, calm, focused and contented.
Studies have confirmed that depression, anxiety, and insomnia are often associated with a lack of serotonin. But if you increase the level of free hormone in the blood, then the mood improves.
Dopamine is the responsible hormone for feelings of pleasure, our motivation and curiosity.
When dopamine is released at the centers of the brain's reward system, we experience joy, enjoyment, and relaxation. This is present in most of our basic survival needs, such as sex, food, social status, etc.