Health & Wellness Calculators
Each tool synthesizes research from Huberman Lab, Stanford, NIH, and peer-reviewed studies into simple, actionable recommendations.
Sleep Calculator
Find your optimal bedtime and wake time based on 90-minute sleep cycles, chronotype assessment, and circadian science.
- ✓ Personalized sleep schedule
- ✓ 5-question chronotype quiz
- ✓ Sleep cycle visualization
- ✓ Light, caffeine, wind-down timing
- ✓ Shareable & downloadable results
Chronotype Quiz
Detailed 15-question assessment based on the Morningness-Eveningness Questionnaire. Discover your natural sleep-wake preference.
Light Exposure Calculator
Optimize timing for natural light exposure based on your circadian phase. Maximize alertness and sleep quality.
Caffeine Timing Optimizer
Personalized caffeine consumption schedule based on your chronotype, sleep goals, and activity level.
Focus Block Planner
Schedule deep work sessions aligned with your natural energy peaks. Based on circadian rhythm research.
Breathwork Timer
Guided breathing protocols for stress reduction, focus, and sleep preparation. Evidence-based patterns.
The ZenDawn Approach
🔬 Grounded in Research
Every tool synthesizes peer-reviewed studies from Huberman Lab, Stanford, NIH, and leading institutions. All claims are hyperlinked to original sources.
⚡ Simple, Not Simplistic
Complex science distilled into calculators that take 60 seconds to use. Personalized recommendations based on your biology, not generic advice.
🆓 Free Core Tools
Essential features are completely free. No credit card required. Premium unlocks depth (tracking, advanced features). Science-based optimization should be accessible.
🔒 Privacy by Design
Your data stays in your browser. No server storage of personal inputs. No selling your data. Transparent, ethical, solo-built.
Built on Huberman Lab Protocols
I've been implementing Dr. Andrew Huberman's science-based protocols for years. These tools are my way of making that research accessible—synthesizing complex neuroscience into calculators you can use daily.
Research-Driven
Every recommendation traces back to peer-reviewed studies. I cite sources so you can verify the science yourself.
Personalized
Tools adapt to your unique biology—chronotype, lifestyle, constraints. No one-size-fits-all formulas.
Actionable
Get specific times, windows, and recommendations you can implement immediately. Not abstract principles.
Continuously Improved
I update tools as new research emerges. Premium features enable tracking and refinement based on your data.
Start with Sleep—The Foundation
Sleep affects everything: focus, energy, mood, recovery. Optimize it first.
Calculate Your Optimal Sleep ScheduleFree • No signup required • Takes 60 seconds • Based on 90-min sleep cycles