Free sleep calculator that finds the best bedtime or wake-up time using 90-minute sleep cycles. Wake up refreshed instead of groggy. No signup, 100% private, runs in your browser.
Recommended sleep for a adult (18-64 years): 7 to 9 hours per day.
Pick a bedtime that lets you finish a full sleep cycle so you wake up refreshed, not groggy.
Based on the average 90-minute sleep cycle. Waking at the end of a cycle helps you feel alert instead of groggy. Everything runs in your browser, so nothing you enter is sent anywhere or stored. This tool is for general planning and is not medical advice.
This free sleep calculator helps you figure out exactly when to go to bed or when to set your alarm so you wake up at the end of a full sleep cycle instead of in the middle of deep sleep. Sleep runs in roughly 90-minute cycles, so waking between cycles is what leaves you feeling groggy even after a long night. Enter the time you need to wake up and the tool works backward to show ideal bedtimes; or enter your bedtime and it shows the best times to set your alarm. It also includes a sleep guide by age based on National Sleep Foundation recommendations, from newborns to older adults, and lets you adjust for how long you usually take to fall asleep. Everything is calculated instantly in your browser with no signup and nothing sent to a server, so it works as a private bedtime calculator, wake-up time calculator, and sleep cycle planner in one. It is built for anyone in the US trying to fix a rough sleep schedule, plan around an early alarm, or just stop waking up tired.
Customers message at midnight, on weekends, whenever they feel like it. Intellure answers every one, captures the lead, and books the appointment while you are asleep, then hands you a full inbox in the morning. One managed AI employee for $299 a month, working across WhatsApp, Instagram, and your website.
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