Dropping the levels of serotonin can result in greater relaxation and allow the brain's intuitive, nonlinear activities to flow more smoothly. It has also been clinically proven that holding your breath has beneficial side effects. This raises the level of carbon dioxide in the body and brain. It also increases the level of nitrogen. For short periods of time, this can be very refreshing to the brain.
Carbon dioxide has many beneficial effects on the body.
As with anything, there needs to be a proper balance. It has been found that increasing the carbon dioxide levels not only improves clear thought but also aids those who suffer from asthma. The electrical quality of the air you breathe also has an effect on serotonin levels and thus creative alertness. The number of positive or negative ions present measures electric air quality. Negative ions are displaced electrons, which attach themselves to nearby molecules.