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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 your own 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

√ 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)


The optional yearly SleepSecure subscription costs $1.99 per year.

It will be charged from your iTunes account after the purchase. You can manage or cancel your auto-renewable subscription by entering the user settings in iTunes after the purchase. The subscription will be auto-renewed 24 hours before the subscription period ends with the same kind of subscription you already bought to the same price. It's not possible to abort the subscription during the time it's active. Terms:

What's New in Version 4.8.1

* Fixed a SleepSecure issue
* General stability and performance improvements

iPhone Screenshot

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Customer Reviews

The Secret to Waking up on Time

I think I have found the perfect combination of alarm clocks. I always set Sleep Cycle to be my first alarm, and another app called SpinMe Alarm Clock as my backup. Sleep Cycle usually wakes me up in my optimal wake up time, but sometimes it just isn’t enough for me and I’ll either snooze through it or turn it off and go back to bed. If Sleep Cycle fails to wake me up, my backup alarm SpinMe will start blaring which can only be turned off if I get out of bed and spin around twice before it finally shuts off! Crazy but it works and I haven’t been late to work since I started doing this. And no you can't just spin the phone around in your hand!

Sleep Cycle really does help in waking you up during your light sleep. I can feel it working most mornings. And I have studied the science behind sleep so I can attest that the premise of this app isn’t merely a placebo, but something that has actually been proven. However the problem that this alarm clock doesn’t solve is that sometimes (especially on nights where you get very little sleep), it can be really easy to ignore your alarm clock and really hard to wake up. That’s where SpinMe Alarm comes in, an alarm clock that is impossible to ignore and forces you awake. I highly recommend using these 2 alarms together. Best few dollars I’ve ever spent.

My Favorite Alarm Clock and Sleep Tracker

First off, I love the soft wake up feature where you set an acceptable window to wake up in and it tries to wake you only when you are ready or it absolutely has to. Because of this, I seldom use the shake to snooze, but it is convenient when I do use it. I also play the soothing rainfall sound when going to sleep which puts my mind in the right frame. The sleep tracking is interesting, but the only useful info that I got from it is that the time at which I go to sleep has the highest correlation with my quality of sleep. The "activities" seem to have very little correlation and the "how do you feel" on wake up is often anti-correlated. This may be because if I had a high quality sleep night, that I am waking up from a deep sleep and initially I feel bad, but after I have been up for a while, I feel pretty good.

So, great alarm, OK sleep tracker, pleasant sleep aid. Very easy and unobtrusive to use. The only 2 things that I would change is to ask "how do I feel" later in the morning and a snore monitor to let me know if my sleep issues may be breathing related.

Great app, with a couple flaws

This app works as intended, no problems there. It's an extremely useful and accurate app. I love the update to change wake up time and sleep notes after the fact. HOWEVER! If you're using this app at night, and if for any reason you need to pick up your phone from your bed and check anything, be prepared for an onslaught of light. I'm talking full-brightness blinding light. I don't understand why this needs to be on full brightness. I just need to change the wake up time, maybe I can't sleep. This app needs to help with that, not hinder it. Additionally, whenever sleep cycle is activated and running, my phone just glitches out to the point of it being unusable. Which in theory is a good thing, because I shouldn't be using my phone if I'm trying to sleep, but in practice is actually quite agonizing, because sometimes I just want to change the music on my phone and it starts treating taps like swipes. This only happens when sleep cycle is on. If these two issues can be fixed, it's five stars from me. Until then, unfortunately, this app is mostly helpful with a small dose of agonizing.

Sleep Cycle alarm clock
View In iTunes
  • $0.99
  • Category: Health & Fitness
  • Updated:
  • Version: 4.8.1
  • Size: 41.6 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.

Customer Ratings

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Top In-App Purchases

  1. year SleepSecure membership$1.99
  2. SleepSecure$1.99