Understand your sleep. Improve your nights.
Explore the science behind dreams and sleep. Use browser-based tools to optimize your sleep cycles, fall asleep faster, and wake up refreshed.
Science-based tools for better sleep
Apply sleep science to your daily routine with these browser-based utilities.
Calculateur de Cycles de Sommeil
Décode tes cycles de sommeil. Trouve les horaires optimaux basés sur la science des cycles de 90 minutes.
Calculateur d'Arrêt Caféine
Découvre quand arrêter la caféine pour une meilleure qualité de sommeil. Basé sur la science de la demi-vie.
Minuterie de Sieste
Décode la science de la sieste. Timing basé sur l'évidence pour éviter l'inertie du sommeil.
Sleep Debt Calculator
Track your weekly sleep deficit and get a personalized recovery plan.
Jet Lag Planner
Get a personalized light exposure schedule to adjust to new time zones faster.
Chronotype Quiz
Discover your sleep chronotype and ideal daily schedule in 2 minutes.
Exercice de Respiration
Guided breathing patterns to calm your nervous system before sleep.
Bruit Blanc et Sons de Sommeil
Steady background sounds to mask disruptive noise and improve sleep quality.
Clear trust signals, not vague claims
A simple nighttime workflow
How RestKit stays free
The site is built to stay usable before monetization gets in the way. That means the ad plan is explicit instead of buried.
- No ads inside calculator results, breathing controls, or active sound controls.
- No ad placements on privacy, cookie, terms, or contact pages.
- Ads may appear after the main content block on long pages and between non-critical sections on informational pages.
We do not rank tools or articles based on sponsorship, and we do not present these tools as medical diagnosis or treatment.