Free Tools
Each takes under two minutes. No email required, no signup, no upsell. They funnel you to the right next article based on your specific situation.
Enter when you need to wake up (or when you're going to bed) and we'll compute the cycle-aligned bedtimes so you wake at the end of a sleep cycle, not in the middle of one.
Open calculator →Eight yes/no questions to assess whether you're likely a habitual nighttime mouth breather. Instant risk score plus evidence-based next steps.
Take the screen →Six questions based on the Horne-Östberg MEQ used in chronobiology research. Find out if you're a morning lark, a night owl, or intermediate — and what schedule fits your biology.
Find your chronotype →A note on accuracy. These tools are based on standard research instruments and reasonable rules-of-thumb, but they aren't medical diagnostics. If your results suggest a condition that needs professional evaluation (sleep apnea, chronic insomnia, circadian disorders), the recommendation is always to see a sleep physician. The tools are a starting point, not a substitute for care.