Ultradian rhythms are biological cycles that repeat more than once per 24 hours. Examples include the 90-minute sleep cycle, the 90–120 minute basic rest-activity cycle (BRAC), and shorter attention cycles.
Key Cycles
- •90-minute cycle — deep work, creative flow
- •20-minute cycle — short breaks, recovery
- •Neurotransmitter depletion — focus depletes; rest restores
In ONDA Life
Part 8 "Ultradian Optimization" works within natural rhythms (90/20-minute cycles) for the timely restoration of neurotransmitters. Working against these rhythms leads to cognitive burnout; working with them supports neural resilience.
Scientific Basis
Built on: Polyvagal Theory (Porges); Psychoneuroimmunology (Ader & Cohen); neuroplasticity research.