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The science behind sleep and energy. Every article backed by peer-reviewed research and interactive tools.
Sleep isn't a passive state. While you sleep, your brain consolidates memories, your immune system regenerates, and your circadian clock recalibrates for the next day. How sharp you feel at 10 AM depends directly on what happened during the past few nights.
The two-process model by Borbély (1982) describes how sleep pressure and circadian rhythm interact to shape your energy curve. Circadian Energy makes this model tangible: using real sleep data, your personal chronotype, and a daily energy forecast.
The articles below explain the science behind the app. Every claim is backed by primary research sources.
Calculate Your Sleep Debt
What happens when you chronically undersleep? Calculate your deficit and learn how long recovery takes.
Self-TestDetermine Your Chronotype
Early bird or night owl? Your chronotype determines when you perform best. Find out with the MSFsc test.
ScienceYour Energy Curve
The two-process model by Borbély explains your afternoon slump and your peak performance times.
Trending 2026Sleepmaxxing
A social media trend with real substance. What sleep research says actually works.
Self-TestSleep Hygiene: 10 Rules
Which habits actually improve your sleep? An interactive checklist based on clinical research since the 1970s.
Interactive CalculatorThe Afternoon Slump
Why you get tired after lunch and when exactly your dip hits. Calculate your personal low point.
Interactive CalculatorBedtime Calculator
Find your ideal bedtime based on sleep need and chronotype. With personalized recommendations.
ScienceHRV and Recovery
What heart rate variability says about your recovery. Age-based reference ranges and interpretation.
ScienceShift Work and Circadian Rhythm
What research shows about night shift recovery and evidence-based strategies.
ScienceNight Owl and Still Healthy?
Social jetlag, not chronotype itself, is the real risk factor. What research shows.
ScienceSleep Inertia: Why Waking Up Is Hard
The neuroscience of morning grogginess and evidence-based countermeasures.
ScienceDelayed Sleep Phase Syndrome
When your internal clock is permanently shifted: diagnosis, genetics, and therapy.
ScienceBiphasic Sleep
What chronobiology says about segmented sleep and the afternoon nap.
ScienceUltradian Rhythms
When your brain is ready for deep work: 90-minute cycles and peak performance.