Sleep Calculator REM calculates your perfect wake-up and bedtime windows based on 90-minute REM sleep cycles. Most people wake up groggy not because they slept less — but because they woke up in the middle of a sleep cycle. This tool fixes that. 🌙 3 Modes: • Wake Up — enter bedtime, get best wake times • Bedtime — enter wake time, get best bedtimes • Sleep Now — instant calculation from now ✨ Features: • Age-based sleep recommendations • Visual REM cycle diagram • Sleep debt calculat
Hey Product Hunt! 👋
I built Sleep Calculator REM because every
sleep tool I tried was either full of ads,
required signup, or didn't explain the science.
This is 100% free, no signup, no ads —
built with pure HTML/CSS/JS.
Would love honest feedback from this community!
Try it → sleepcalculatorrem.com 🌙
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