Sleep Calculator Cycle started with a simple idea: most people don't need more sleep advice, they need the right time. Your night runs in roughly 90-minute sleep cycles, and waking up at the end of one feels very different from waking up in the middle of deep sleep.
What we do
- Build free, fast tools like our sleep calculator and nap calculator. No sign-ups and no personal data needed.
- Write practical guides on sleep cycles, bedtimes and naps on our blog.
- Keep things simple, honest and easy to use on any phone.
How we write
Our articles are based on widely accepted sleep science and public health guidance. We update them when guidance changes. Our content is for general information only and is not a substitute for advice from a doctor.
Get in touch
Questions, ideas or corrections? Visit our contact page.