Natural 90-120 minute cycles of alertness and energy that repeat throughout the day, forming the scientific basis for productivity techniques like 90-minute focus sessions and explaining why our concentration naturally waxes and wanes.
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Ultradian Rhythms
Ultradian rhythms are cycles that repeat numerous times throughout a 24-hour period, typically lasting 90-120 minutes. We routinely experience peaks when we're highly-focused, as well as dips when we feel sleepy and distracted.
Our biological prime time is driven by these ultradian rhythms. From a cognitive science perspective, these rhythms represent natural cycles of cognitive arousal that affect our ability to focus, process information, and perform mentally demanding tasks.
Research shows that our bodies naturally move through cycles of approximately 90-120 minutes where we experience:
Many productivity experts recommend working in 90-minute blocks aligned with these natural rhythms:
Unlike the Pomodoro Technique's 25-minute intervals, 90-minute sessions:
Monitor your energy levels throughout the day for 1-2 weeks to identify your personal ultradian rhythm patterns.
Taking breaks during trough phases allows your brain to:
The 24-hour sleep-wake cycle affects overall alertness throughout the day.
Shorter cycles within the circadian rhythm that create moment-to-moment variations in energy and focus.
Both rhythms interact - ultradian peaks during circadian highs are more pronounced than those during circadian lows.
Working with rather than against ultradian rhythms can:
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