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Sleep Cycle alarm clock

By Northcube AB

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Waking up made easy.

An intelligent alarm clock that analyzes your sleep and wakes you in the lightest sleep phase – the natural way to wake up feeling rested and relaxed.

Sleep Cycle helps millions of people to wake up rested!

Featured in: CNN, Wired, The Guardian, The Wall Street Journal, BBC, The New York Times and many more.

#1 Top Paid app in United States
#1 Top Paid app in United Kingdom
#1 Top Paid app in Japan
#1 Top Paid app in Germany
#1 Top Paid app in France
#1 Top Paid app in Russia
#1 Top Paid app in Canada
...and many more.

"It just works. Period. It does exactly what it advertises which is absolutely amazing."
-- 5/5 stars on

Sleep cycle is continuously rated as the best smart alarm clock, Sleep Cycle is now the worlds most used intelligent alarm clock.


* Sleep Cycle monitors your movement during sleep using the extremely sensitive accelerometer in your iPhone.

* Sleep Cycle then finds the optimal time to wake you up during a 30 minute window that ends at your set alarm time.

* Look at the screenshots for recommended iPhone placement.


As you sleep you go through different phases, ranging from deep sleep to light sleep. The phase you are in when your alarm goes off is critical for how tired you will feel when you wake up.

Since you move differently in bed during the different phases, Sleep Cycle can use the accelerometer in your iPhone to monitor your movement and determine which sleep phase you are in.

Sleep Cycle wakes you when you are in your lightest sleep phase.

Sleep Cycle was developed using proven sleep science and years of research and development.



√ Waking up made easy! Sleep Cycle analyzes your sleep and wakes you in your lightest sleep phase.

√ Detailed sleep statistics and sleep graphs for every night.

√ 15 carefully selected, high quality, alarm melodies.

√ Use iPod music as wake up sound

√ Snooze by shaking or tapping the phone lightly.

√ Customizable wake up window. From instant (regular alarm clock) up to 90 minutes.

√ Background mode - set your alarm and exit Sleep Cycle - sleep analysis will continue in the background

√ Sleep aid - helps you fall asleep. The intelligent mode detects when you fall asleep and automatically fades the sleep aid sound.

√ Support for the M7 co-processor - measure your daily physical activity and calculate how it affects your Sleep quality

√ Heart rate monitor - measure your resting heart rate (RHR) every morning using the camera and flash in your device.

√ Sleep notes - see how events such as drinking coffee, eating too much or having a stressful day affect your sleep quality

√ Long term graphs - track sleep quality over time, see which days of the week you sleep best and much more

√ Export sleep data to Excel for detailed analysis


Ability to charge your phone by the bed
Ability to place your iPhone according to the instructions (see screenshots)

What's New in Version 4.4.1

- Fixed a bug causing flat sleep graphs for some users.
- A few fixes for heart rate and activity long term graphs.
- A fix for time zone error in the long term graphs.
- A fix for silent notifications: Activate AirPlay support under Settings/Advanced and keep Sleep Cycle in the foreground without locking your phone during the night.


News in Sleep Cycle 4.4:

Do you own an iPhone 5s? Sleep Cycle will automatically measure your daily physical activity and calculate how it affects your Sleep quality. Includes long term graphs over your daily steps.

Measure your resting heart rate (RHR) every morning using the camera and flash in your device. The morning heart rate can be used to avoid overtraining, track the results of your basic training and overall health (activate under Settings, iOS6 and above).

Sleep Cycle automatically adapts your graphs to the local time zone. Perfect if you travel a lot (will not be applied to your old nights).

- AirPlay support is back, let the alarm sound in your external speakers (activate under Settings/Advanced).
- Major update to SleepSecure for backing up your entire database or transferring your database to a new device
- Graphs slightly redesigned and a new app icon without gradient
- Several other design and stability improvements

iPhone Screenshots

iPhone Screenshot 1
iPhone Screenshot 2
iPhone Screenshot 3
iPhone Screenshot 4
iPhone Screenshot 5

Customer Reviews

Wonderful addition to fitbit

I had strong doubts about this app at first, but gave it a shot and matched it up with my fitbit flex sleep results. To my surprise they were the same! Albeit this app gives more data and adds sleep notes! Using sleep notes I am able to see how different medications for insomnia affect my sleep and it is greatly helping me hone in on the best medication for me.

I have no idea what it bases the increase or decrease in sleep quality on though, is it all compiled (making it less accurate) or does it base it off of nights in which you slept with no aids or caffeine. I have no idea how to find out. So while that may not be entirely accurate, it is still helpful enough to point the user in the right direction. Not a perfect app, but certainly worthy of 5 stars for design, simplicity and accuracy of sleep cycle with a pleasant wake up alarm. Though I sleep with music very similar to the alarm so I am always woken up by the phone vibrating, but I completely agree being woken up in the light cycle is much more comfortable than being woken up during rem sleep. Recommend this to anyone able to sleep with their phone on their bed and anyone who has been prescribed new medications and would like to better know how they are affected.
By the way I almost never write reviews, even for good apps I enjoy, so this means a lot coming from me! All I can say is, this app proved me wrong and I couldn't be happier that it did.

Fantastic app that just keeps getting better!

**edit to original 5 star review (below)** Dear Developers: Please design a new feature that allows you to choose "go back to sleep" when you wake up. (I just now woke up and picked up my phone and touched the screen to see what time it was only to accidentally turn off sleep cycle. So sad!) Or if we could choose to combine two sleep periods that would fix the problem, too. There are times when I've gone back to sleep for an hour or so after the time for which I originally set my alarm-- it would be nice to be able to combine two sets of data. Thanks & keep up the great work!

Absolutely love this app. I have been using it almost every night for the last 3 years so I've seen it go through many transformations. What was simply a movement monitor avoid waking you during deep sleep, now also allows you to integrate sleep notes (notes about your day) to correlate them with sleep quality. Most recently they have included an option to test your heart rate in the morning, and are incorporating "activity" which is automatically tracked (both iPhone 5 or later). While this particular note hasn't quite been refined yet (I don't always have my phone on me so this will be an underestimate for a lot of us), knowing these guys it will be soon! I highly recommend this app! Especially to people who like data :)

To the developers: Thanks for all the hard work and wonderful app!!

App Everyone Should Have

I was not a morning person. I downloaded this app yesterday and I've never had a better night sleep. The sound of the waves is very relaxing and caused me to go right to sleep. I also use a sound machine. I was worried that I wouldn't be able to hear the alarm through the sound machine but I could. The alarm woke me up gently with it's soft, calming music. No more must I hear my alarm blaring. When I woke up I felt refreshed and remembered I had some data to look at! It's actually really fun and exciting. The app showed me how deep of a sleep I was in at each time. I found this interesting and now look forward to the morning.
One recommendation I do have is that a nap setting be created. This way, you could set how long of a nap you wanted, and the alarm wouldn't go off until that time. So people, go out and buy this app it is totally worth the money.
Also, just one thanks to the people who price the app. I noticed that on March 22nd you raised the price to $2.99. THANK YOU FOR BRINGING IT BACK DOWN TO $.99! This was a very smart decision as you fell from first to, I believe 8th on the list of most downloaded or highest rated.

Sleep Cycle alarm clock
View In iTunes
  • $0.99
  • Category: Health & Fitness
  • Updated: Jan 09, 2014
  • Version: 4.4.1
  • Size: 25.3 MB
  • Languages: English, French, German, Italian, Japanese, Simplified Chinese, Spanish, Swedish
  • Seller: Northcube AB

Compatibility: Requires iOS 5.0 or later. Compatible with iPhone, iPad, and iPod touch. This app is optimized for iPhone 5.

Customer Ratings

Current Version:
All Versions:

Top In-App Purchases

  1. year SleepSecure membership$19.99

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