I want to wake up at:
Welcome to SleepyTimeAlarm.com
Most alarms wake you up at the wrong time, leaving you feeling groggy and tired. Our free sleep calculator uses the science of the 90-minute sleep cycle to recommend the most natural wake-up times and bedtimes so you can wake up refreshed.
How It Works
1. Choose a Sleep or Wake Time – Enter the time you plan to go to bed or the time you need to wake up.
2. Get Sleep Cycle Suggestions – Our smart sleep cycle calculator instantly finds the best bedtimes and wake-up times aligned with natural sleep stages.
3. Set Your Alarm – Choose one of the suggested bedtimes or wake-up times to enjoy a fresh, energized morning.
Why Choose SleepyTimeAlarm.com?
Wake Up Refreshed – No more endless snoozing or morning grogginess.
Simple & Free – Just enter your time, get instant results, and set your alarm.
Science-Based – Built on proven 90-minute sleep cycle research.
Accessible Anywhere – Works online, no downloads required.
With SleepyTimeAlarm.com, you’ll finally know the best times to go to bed and the best times to wake up, so you feel rested, alert, and ready for the day.
Try the Sleep Calculator NowFrequently Asked Questions
What is the best time to wake up?
The best time to wake up depends on completing a full sleep cycle. Each cycle lasts about 90 minutes. Our sleep calculator helps you choose wake up times that avoid interrupting deep sleep, so you feel refreshed.
How does a sleep cycle calculator work?
A sleep cycle calculator works by counting your sleep in 90-minute cycles. Instead of setting a random alarm, our tool suggests the best times to go to bed or wake up. This ensures you complete full cycles for easier mornings.
How many hours should I sleep?
Most adults need 7–9 hours of sleep per night, which equals about 5–6 complete sleep cycles. Our sleep alarm calculator and sleep cycle calculator help you plan the right amount of rest and wake up at the best possible time.
What is a 90-minute sleep cycle?
A 90-minute sleep cycle is the body’s natural rhythm, moving from light sleep into deep sleep and REM. Our bedtime calculator ensures you wake up at the right stage for a fresh morning.
Is 6 hours of sleep enough?
While some may feel rested with 6 hours of sleep, most adults need 7–9 hours. Using our wake up time calculator, you can experiment with different bedtimes to find what works best for your lifestyle.
Can a sleep calculator improve my mornings?
Yes . By aligning your wake up time with natural sleep cycles, our sleep calculator helps reduce morning grogginess and makes it easier to feel energized throughout the day.