WakeUpTimeCalculator.com - Wake up refreshed, not groggy — every single morning

Hey Product Hunt! 👋 I'm Rajul Raturi — founder of WakeUpTimeCalculator.com, and I've been in the IT industry for 25+ years. The idea came from a very personal frustration. I kept waking up at 7am feeling absolutely destroyed — even after 7-8 hours of sleep. I'd hit snooze 4 times, drag myself to coffee, and wonder why mornings felt like punishment. Then I discovered sleep cycles. Turns out, HOW you wake up matters just as much as HOW LONG you sleep. If your alarm goes off during deep sleep (Stage 3), your brain is in its most offline state — and you feel groggy for hours. This is called sleep inertia. The fix? Simply time your alarm to the END of a 90-minute sleep cycle. I built WakeUpTimeCalculator.com to make this dead simple: ✅ Enter your bedtime → get 6 optimal wake-up times ✅ Enter your wake-up time → get the best bedtimes ✅ No signup. No ads. Instant results. It's based on the same 90-minute sleep cycle model used by sleep researchers worldwide. I'd love your feedback — especially on what features you'd want next! 🙏 — Rajul