Free interactive tools
Use SnapSleep calculators and check-ins privately, with visible assumptions and limitations.
Enter planned lights-out and a realistic sleep opportunity to calculate a planned wake time. This is clock arithmetic—not a sleep-cycle or sleep-stage prediction.
Open the free tool →Calculate diary-based sleep efficiency from estimated total sleep time and time in bed, then interpret the number as a pattern—not a diagnosis or treatment target.
Open the free tool →Explore morning, intermediate, or evening timing tendencies from free-day sleep and alertness patterns without treating a short quiz as a diagnosis or fixed identity.
Open the free tool →Estimate the difference between your sleep need and recent sleep duration.
Open the free tool →Work backward from bedtime by a chosen caffeine buffer so the assumption is visible and easy to adjust.
Open the free tool →Work backward from a required wake time, sleep-opportunity goal, and wind-down allowance to plan when the routine should begin.
Open the free tool →Organize sleep opportunity, schedule, symptoms, medication, and safety context into a clearer next question without diagnosing the cause of fatigue.
Open the free tool →Combine recent sleep, caffeine timing, and perceived stress into a simple planning prompt without a wearable or overnight recording.
Open the free tool →Compare sleep opportunity with a rough 90-minute cycle model while making clear that real sleep cycles vary through the night and between people.
Open the free tool →Build a transparent planning score from recent sleep, caffeine buffer, stress, and wind-down readiness without pretending to measure sleep stages.
Open the free tool →Choose a conservative nap plan from current sleepiness, available time, bedtime proximity, and safety context.
Open the free tool →The result appears before any email or app suggestion.
Every estimate explains its limits instead of implying false precision.
Inputs stay in the current browser session and are not submitted to the CMS.