PortalsOS

In the first half of the day, dopamine and norepinephrine are elevated in the brain, body, and bloodstream much more than serotonin. This affects our perception of time and suggests we should tackle the hardest tasks early in the day.

Most people feel more energetic in the spring due to decreasing melatonin levels as days get longer.

Disruptions in circadian entrainment cause huge health problems, increasing cancer risk, obesity, and mental health issues.