Ultradian cycle

Ultradian cycles are physiological cycles that occur throughout the day in shorter durations than the well-known 24-hour circadian rhythms. According to Andrew Huberman, ultradian cycles, particularly those lasting about 90 minutes, play a significant role in how our brain functions and manages tasks like focus, learning, and even sleep.

During these 90-minute cycles:

• It's suggested to engage in focused mental or physical activities, accepting that focus may flicker but should generally maintain across the cycle.
• These cycles are optimal for learning and attention, appearing prominently during both sleep and wakefulness.
• In learning contexts, especially for complex motor skills or cognitive tasks, leveraging these ultradian cycles can enhance focus and neuroplasticity, even though each cycle may start with some initial difficulties in focusing.

Dr. Huberman recommends setting a timer for these cycles during tasks and breaks, ensuring that one doesn't expect consistent high focus throughout the entire duration but utilizes the peak effectiveness of this period for productive work or learning.

For more details on how to effectively use these cycles in daily activities, refer to 1 and 2.