Sleep Cycle Bedtime Calculator

Name: Sleep Cycle Bedtime Calculator
Rating: 4 (212 reviews)
Author: Kai Oelfke

Wake Up & Bed Time Schedule

Free · Designed for iPad

212 Ratings
Ages

4+
Years
Category

Health & Fitness
Developer

Kai Oelfke
Language

DE
German
Size

14.7
MB

Sleep smarter. Feel more refreshed. Calculate the best time to wake up or when to go to bed. It's based on sleep cycles. They're about 90 minutes each and it's good to get 5-6 cycles. Sleeping at midnight for 5 cycles? Wake up at 7:30 AM. Need to wake up at 6:00 AM, but want 6 cycles? Then hit the bed at 9:00 PM. Not falling asleep immediately? Customize your fall asleep time. PS: Most people need ~ 15 minutes to fall asleep. - Apple Watch support - Customize time to fall asleep

Ratings & Reviews

4.0

out of 5

212 Ratings

JimSpeedy1dino
11/28/2024

JimSpeedy1Dino
Where I found this app helpful is, I noticed I naturally wake up near 7:40 am most days. If that’s normal for me, then I might consider being in bed by a certain time. It is something to try for be better sleep health. The app offers two choices.

Developer Response
It’s very good to keep bed and wake up time consistent for your body. Thank you for the review. Best, Kai
JimSpeedy1dino
11/28/2024

JimSpeedy1Dino

Where I found this app helpful is, I noticed I naturally wake up near 7:40 am most days. If that’s normal for me, then I might consider being in bed by a certain time. It is something to try for be better sleep health. The app offers two choices.
Developer Response 11/30/2024
It’s very good to keep bed and wake up time consistent for your body. Thank you for the review. Best, Kai
Doesn’t actually do anything
04/07/2024

Wendyannh
All this app does is tell you how many hours of sleep you’ll get at 6 possible times based on what time you tell it you want to go to bed, or the exact reverse, what time you need to go to bed if you want to wake up at a particular time and want to get X hours of sleep. IOW, all it does is 1st grade arithmetic, which you can obviously easily count yourself, whether forwards or backwards, by just adding or subtracting X hours from your desired bedtime or wake up time. It actually skips two hour twice in each section, so if you want a time in between those pairs, you’ll have to manually calculate it anyways. In fairness, that’s really all it says it will do, and the changes are instant, as you turn the dial. The problem is the app came up when I searched on “sleep tracker” - and it just doesn’t actually track anything at all, so it seems that the developer has miscategorized it. But s/he *did* say it’s a sleep tracker, so the fact that it definitely isn’t what I’m basing my stars on. *And* the thing about the skipped hours.

Developer Response
I am sorry for the confusion Wendy. I don’t categorize or describe the app as a sleep tracker. It’s as you found out a simple calculator. Some people find it convenient instead of doing the math themselves. Apple‘s search algorithm automatically decides to put my app for sleep tracker. It’s not my fault and I can’t do anything against that. The rows are based on sleep cycles, which are 90 minutes. So that’s why it’s not listing each hour. According to some sleep research it‘s better to wake up after a multiple of 90 minutes instead of in between a sleep cycle. If you can consider editing your rating it’ll help people, who’re looking for a simple sleep time calculator like my app.Here’s the description, which doesn’t mention sleep tracking:Sleep smarter. Feel more refreshed. Calculate the best time to wake up or when to go to bed. It's based on sleep cycles. They're about 90 minutes each and it's good to get 5-6 cycles. Sleeping at midnight for 5 cycles? Wake up at 7:30 AM. Need to wake up at 6:00 AM, but want 6 cycles? Then hit the bed at 9:00 PM. Not falling asleep immediately? Customize your fall asleep time. PS: Most people need ~ 15 minutes to fall asleep.- Apple Watch support- Customize time to fall asleep
Doesn’t actually do anything
04/07/2024

Wendyannh

All this app does is tell you how many hours of sleep you’ll get at 6 possible times based on what time you tell it you want to go to bed, or the exact reverse, what time you need to go to bed if you want to wake up at a particular time and want to get X hours of sleep. IOW, all it does is 1st grade arithmetic, which you can obviously easily count yourself, whether forwards or backwards, by just adding or subtracting X hours from your desired bedtime or wake up time. It actually skips two hour twice in each section, so if you want a time in between those pairs, you’ll have to manually calculate it anyways. In fairness, that’s really all it says it will do, and the changes are instant, as you turn the dial. The problem is the app came up when I searched on “sleep tracker” - and it just doesn’t actually track anything at all, so it seems that the developer has miscategorized it. But s/he *did* say it’s a sleep tracker, so the fact that it definitely isn’t what I’m basing my stars on. *And* the thing about the skipped hours.
Developer Response 04/09/2024
I am sorry for the confusion Wendy. I don’t categorize or describe the app as a sleep tracker. It’s as you found out a simple calculator. Some people find it convenient instead of doing the math themselves. Apple‘s search algorithm automatically decides to put my app for sleep tracker. It’s not my fault and I can’t do anything against that. The rows are based on sleep cycles, which are 90 minutes. So that’s why it’s not listing each hour. According to some sleep research it‘s better to wake up after a multiple of 90 minutes instead of in between a sleep cycle. If you can consider editing your rating it’ll help people, who’re looking for a simple sleep time calculator like my app.Here’s the description, which doesn’t mention sleep tracking:Sleep smarter. Feel more refreshed. Calculate the best time to wake up or when to go to bed. It's based on sleep cycles. They're about 90 minutes each and it's good to get 5-6 cycles. Sleeping at midnight for 5 cycles? Wake up at 7:30 AM. Need to wake up at 6:00 AM, but want 6 cycles? Then hit the bed at 9:00 PM. Not falling asleep immediately? Customize your fall asleep time. PS: Most people need ~ 15 minutes to fall asleep.- Apple Watch support- Customize time to fall asleep
Perfect
10/20/2025

ZachAttack316
I like how I can easily see what time I should go to bed or what time I should wake up based on my cycles. I have noticed that I’m not as drowsy in the morning (if I follow it and go to bed). It would be cool to eventually be able to see more data from Apple in the app like if my cycles align with the typical 90 minutes but for now I’m not complaining. Thanks for this app!

Developer Response
Thank you! Best, Kai
Perfect
10/20/2025

ZachAttack316

I like how I can easily see what time I should go to bed or what time I should wake up based on my cycles. I have noticed that I’m not as drowsy in the morning (if I follow it and go to bed). It would be cool to eventually be able to see more data from Apple in the app like if my cycles align with the typical 90 minutes but for now I’m not complaining. Thanks for this app!
Developer Response 10/23/2025
Thank you! Best, Kai
My new favorite
11/29/2025

occasional downloader
I like that it in addition to the times to wake up, shows the number of hours you’ll get, and highlights the two best ones for a full night’s sleep. And I love that it doesn’t collect any data or otherwise compromise user privacy—and that it’s FREE.

Developer Response
Thank you! Best, Kai
My new favorite
11/29/2025

occasional downloader

I like that it in addition to the times to wake up, shows the number of hours you’ll get, and highlights the two best ones for a full night’s sleep. And I love that it doesn’t collect any data or otherwise compromise user privacy—and that it’s FREE.
Developer Response 12/06/2025
Thank you! Best, Kai

- Sleep Analysis: Get insights on your sleep with sleep data from Apple Health (requires sleep tracking with Apple Watch or iPhone) - Sleep Consistency chart: Going to bed at the same time improves your sleep and health according to studies. With this chart you can see how often you go to sleep within 30 mins of your average bed time.