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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 and M8 co-processor - measure your daily physical activity and calculate how it affects your Sleep quality

√ Health app - fully integrated with the Health app introduced in iOS8. Submits sleep analysis and heart rate. Downloads other data such as fitness information to be considered in your nightly Sleep Quality

√ Adaptive design - ready for all screen sizes

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

√ Philips HUE light bulb support - simulate a natural sunrise to give you an even softer wake-up

√ 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 4.7.2

Fixing a critical bug fixing a stability issue for some users.

iPhone Screenshot

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

Customer Reviews


I would like to be able to wake up, stop the alarm and continue the sleep cycle on days when I want to sleep in or am still tired upon waking.

How does the "intelligent" mode for sleep aid work? More information might be helpful. It seems to go quiet too soon fore so I changed to an absolute 30 minutes. But now I notice that I wake as soon as the sound stops! I would like the sound to continue until the app judges that I am asleep and start again if I wake up.

But I don't think the app is accurate at judging when I'm awake and when in light sleep. So many times I know I've been tossing and turning for a couple of hours but the app will show that time as light sleep. Maybe that's why intelligent mode of sleep aid went silent much too soon.

And I would like to know how the app calculates the number of steps taken, and also how it analyses sleep to arrive at sleep quality. Information, please!

Another thing I would like to see is information on what the ideal is: how much sleep, what quality to aim for, what amount of deep sleep, etc. Is there an ideal graph shape or a bad shape to watch out for?

I'm mystified by some of the extra graphs and their usefulness but no doubt all will be revealed in time.

But having said all that, I love the app and despite my sleep quality being not great, I still wake feeling good because the app wakes me at the right point in the cycle. It's fabulous. And just keeping these records is very valuable.

Love this app!

I do love this app. I love tracking my sleep and I am waking up a lot less cranky then I used to because it wakes me at the right time. It's also good to know how various factors effect your sleep with the sleep notes.
I am not sure how accurate it is though on judging when I am asleep. Sometimes the sleep aid will go off before I have fallen asleep, but the next morning when I look at my data, it knows that I didn't fall asleep until after the sleep aid went off. Other times I have gotten out of bed for whatever reason in the night, but it says I slept through.
I wish it didn't tell me how much time I've spent in bed overall, and I would like to know how it calculates how many "steps" I have taken.
Apart from that, it is a very handy app to have and I use it every night!


I don't know if it's just me, but in the vibration settings I thought there was 1) vibration was only used when sound does not wake you up 2) vibration is never used 3) no wake up sound will play. The iPhone will only vibrate. I thought this option used to be 3) The iPhone will vibrate. Sound will play if you are not awake after the set time. Or something similar, I'm not sure if this is me or is has changed, if it has changed I'd like to know why and ask it be returned as I am no longer staying awake once the alarm finishes, the current vibration doesn't fully wake me without the sound at the end. If this never existed can you make it an option. Other than that I love the app, it's great but I'm just not sure what happened.

Sleep Cycle alarm clock
View In iTunes
  • $2.49
  • Category: Health & Fitness
  • Updated:
  • Version: 4.7.2
  • Size: 30.0 MB
  • Languages: English, French, German, Italian, Japanese, Simplified Chinese, Spanish, Swedish
  • Seller:

Compatibility: Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch. This app is optimized for iPhone 5, iPhone 6, and iPhone 6 Plus.

Customer Ratings

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  1. year SleepSecure membership$2.49