Find the best time to go to bed or wake up based on 90-minute sleep cycles, so your alarm lands between cycles instead of in the middle of deep sleep.
Xerion works on a simple one-time license: $25 once, no subscription, and every tool on the platform is included - Sleep Cycle Calculator and 198 others. New accounts can look around before buying.
Yes. Many Xerion tools, including much of what Sleep Cycle Calculator does, run entirely in your browser. Anything you save is stored in your own account, never sold, and never shown to advertisers - there are no ads on Xerion.
No. Sleep Cycle Calculator runs in any modern browser on Windows, Mac, Linux, iPhone, and Android. There is nothing to download, update, or uninstall.
Yes - every Xerion tool is built mobile-first, and Sleep Cycle Calculator works on any phone or tablet with a modern browser.
Your license unlocks all 199 tools on Xerion - everyday tools like this one, plus PDF tools, planners, trackers, generators, and more. Browse the full directory to see everything.
Sleep Cycle Calculator and 198 other tools for a single one-time $25. No subscription. No ads. No upsells mid-task.
Get lifetime access →