Sleep Calculator - Wake up right—sleep cycles calculated for you

👋 Hey Product Hunters! I built SleepCalc after realizing the most-asked 2 a.m. question is “What time should I wake up if I go to bed now?” Existing “sleep calculators” were either buried in ads, gated behind app downloads, or ignored the 15-minute “fall-asleep” window that makes the math actually work. So I stripped the idea down to a single, lightning-fast web page—no sign-ups, no cookies that track you across the internet, just science-based results in one click. What’s new today? • Nap & Shift-Work modes for power-nappers and night-shift heroes • A slick circadian chart so you see why each wake-up time matters • One-line embed widget + public API, so any blogger can add the calculator to their site in 60 seconds I’m proud that SleepCalc loads in < 0.5 s, works offline on mobile, and stays 100 % free. Your feedback will drive the next features (jet-lag planner? smartwatch sync?). Try it, break it, tell me how it can serve you better—can’t wait to hear your thoughts! 😴🚀