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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.

The more dopamine that's released into our brain, the more we tend to overestimate how much time has passed. These experiments are very straightforward and objective. At the 38-second mark, people might say, "I think a minute is up."

You can't cheat the circuits related to acetylcholine and dopamine; after about 90 minutes, focus diminishes.

Today we covered time perception, entrainment, the role of dopamine, habits, and routines that adjust your sense of time for specific goals.

Most people probably won't be able to handle more than two 90-minute focus cycles per day.

Habits in the context of dopamine reward and time perception mean placing specific routines at intervals. This leads to dopamine release related to reward, motivation, and feeling good.

The ability to perceive time accurately is fundamental to performing tasks well.

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