Glossary / Ultradian Rhythm

Ultradian Rhythm

Recurring 90-120 minute cycles of physiological arousal during the day.

Discovered by Nathaniel Kleitman. Explains why deep work in 90-minute blocks aligns naturally with your body's attention peaks.

Related

• Circadian Rhythm — A roughly 24-hour cycle of biological processes.
• Deep Work — Cognitively demanding work performed in a distraction-free state.

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More from the glossary

• Pomodoro Technique
• Flowtime Technique
• Deep Work
• Shallow Work
• Flow State
• Circadian Rhythm
• Chronotype
• Default Mode Network
• Diffuse Thinking
• Focused Thinking