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Sleep Time: Sleep Cycle Alarm

by Azumio Inc.

(271 user ratings)


Download size: 206.49MB
Version: 5.158
Released: 2012-09-11
For ages: 4+

Fall asleep, stay asleep, and wake up refreshed!

Sleep Time doubles as a comprehensive sleep analysis app and alarm clock. Celebrating the release of version 2.21, Sleep Time is the first sleep app with iOS 8 support and Apple Health integration!

With over 35 million users, the award-winning Sleep Time app is all over the web.


“Azumio has fulfilled the need for an accurate, state-of-the-art algorithm for sleep analysis that is consumer-accessible as an integral part of a complete mobile health solution” - Dr. Paul Zei, Stanford University

5/5 “I’ve tried several apps that log the amount of sleep and the types you experience, and the interface of Sleep Time is the best by far. It’s easy to understand and simple to use.”

5/5 “Fascinating results. It works remarkably well providing helpful information.”

Featured on: TechCrunch, Mashable, Lifehacker, 148apps, eHealth, and many others...

#1 Sleep Analysis app in United States
#1 Sleep Analysis app in Japan
#1 Sleep Analysis app in United Kingdom
#1 Sleep Analysis app in Australia
#1 Sleep Analysis app in Germany
#1 Sleep Analysis app in France
#1 Sleep Analysis app in China
#1 Sleep Analysis app in Russia
#1 Sleep Analysis app in Canada
… and many more.



√ Set the alarm clock with a single gesture

√ Fall asleep to soundscapes or white noise!

√ Alarm rings even in silent mode

√ Choose from any of our 20 built in alarms

√ OR wake up to your favorite song from iTunes!

√ Sleep Lab™ with sleep cycle analysis

√ Detailed monthly and weekly graphs

√ Advanced wake-up optimization algorithm

√ Instant Heart Rate integration to detect pulse after waking up

√ Full history and graphs make comparison easy

√ Backup and restore your sleep data on the cloud

√ No glasses needed for our easy to read interface!

√ Apple Health Integration

We make Sleep Time for our users and we’d love to hear your feedback – tell us what you think so we can implement your ideas and suggestions in the next update!

Upgrade to Premium to receive unlimited access to Premium Programs and Playpen Freeplay workouts, HD videos, dynamic and motivational audio, workout email summaries with tips and advice on healthy living, priority support, and more for $9.99/month or $29.99/year through renewable iTunes subscription.

We offer auto-renewable subscriptions with the following specifications:
- Payment will be charged to your iTunes account at confirmation of purchase
- Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period
- Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase
- No cancellation of the current subscription is allowed during active subscription period
- Any unused portion of a free trial period, if offered, will be forfeited when the user purchased a subcription to that publication
- Our privacy policy and terms of use: https://www.azumio.com/page/privacypolicy

Please note: Continuous use of GPS activities in the background can dramatically decrease battery life.

Sweet Dreams,
Azumio Team
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Customer Reviews
Great app

Great App Thanks ⭐️⭐️⭐️⭐️⭐️

Alarm didn’t go off

Really liked this app until today. After setting the alarm last night it did not go off this morning. This happened once before but it was on a day off and I honestly forgot about it until it happened again this morning and made my partner late for an incredibly important meeting. Will not continue using until the alarm is reliable.

Better sleep!

I love falling asleep to the sound of ocean waves, but I really notice how much more refreshed I feel when I wake up at a natural part of my sleep cycle. This app can really tell when you’re sleeping lightly and will wake you up gently. In researching sleep, I’ve learned each cycle lasts 90 mins. Ideally, we should get about 7 1/2 or 9 hours of sleep - not 8 - so try to set your wake up time accordingly for the best wake up experience.

Good Alarm

Everything is great except the advertisements with loud sounds that catch you by surprise.

It’s fairly good

This app is a slightly better way to wake up than abrupt, exactly-timed alarms on your phone or clock. It’s marginally obnoxious when it comes to the sheer amount of ads, but they don’t interfere with the functionality of the app so its easy to ignore. This is helpful if you sleep in a room with others and your alarm continually wakes them up too. It’s starts very quiet and gradually gets louder, so it should wake up the other person less often. It helped when i was in a dormitory back in college. But tbh, if you have really bad battery life already, the benefit from the app prolly isn’t worth it. Otherwise i totally recommend this app.

Pretty good

I suspected that I had a sleep disorder and this app has confirmed it. Worth having.

Great way to wake up

Like how the volume slowly increases!

Was the best

Up until this last update I would recommend this app to every one I knew. I absolutely loved it. However, after this last update all of a sudden it doesn't work like before. I can set the alarm and listen to my sounds before bed (it acts completely normal) but when I wake up in the morning it's not on anymore. Just my lock screen which I shouldn't see. Thank goodness I woke up on my own 2 of the days and the 3rd was a day off. Only late to work by 15 minutes because of it. If they can fix whatever bug is causing the app to crash in the middle of the night I will definitely up my review.

Want to track your sleep?

This is a great app for seeing how you sleep! Nice UI and easy to use. Very accurate and easy to understand.

App crashes when trying to view insights

I really enjoy this app and use it daily. Within the last week though, the app crashes when I click on the Insights option. I am able to access all other functions. Will you please look into this? Thank you.

App crashing

Love the app but just today whenever I click on insights the app crashes.

My most useful app until adds came

Do you know the last thing you want to see when you're exhausted and trying to stumble in to bed at the end of a long day, and make sure you responsibly wake up on time? An ad right where you're trying to set your alarm clock. Absurd. I've almost rage-deleted this app a dozen times in frustration. The app blinking to dark mode while setting it is also nearly unusable, and now it crashes every time I tap "Insights." Used to be the app that increased my productivity the most. Now I'm taking time out of my brief morning minutes to warn you to look elsewhere. I don't expect fixes from these cash grabbers any time soon, though I'm happy to update my review if they do.

App crashes when trying to view history

I’ve been using this app for years, but suddenly it now crashes every time I tap on “Insights” to view my sleep history. I was just looking at other reviews and this same problem was mentioned by other reviewers. Seems it started happening with the latest update a few days ago. The other problem, which has existed for years, is that the app cranks up the volume to maximum whenever the alarm goes off. I have to remember to manually turn it back down each day before using the phone. This problem does not happen if I stop off the tracker before the alarm rings. Please fix these two problems!

Things Were Fine But Then . . .

With this latest update (5.150) the app closes anytime I try to look at my sleep history. Please, can this be fixed?

Scam with an auto renew for year

Scam! Do not download. I was traveling in Europe and was looking for a sleep app. Must have been the middle of the night but I down loaded this on accident. Next thing you know I start getting charged: $9.95 for one month and then an auto subscription for $29.95++ for one year. Thank goodness Apple refunded my money! By the way: the app didn’t work the one time I used it.


I use this app every night. I really enjoy the soft wake up tones.

Poor Choices from Developer

Let’s start with the “free” app costing $1.99. That’s not free. They push their subscription a bit too hard, making it challenging to just use the app. The ad screens are hard to close! Also, as you go to bed and set the alarm, an ad for a mobile game pops up. I’m trying to go to sleep! That’s just careless on the developers part. It’s evidence that they don’t actually care about your health if they want to encourage you to play games unless you pay them. Finally, the app is unreliable. Several times I’ve gone to bed and the alarm never goes off. The app crashed! Twice, I’ve received a phone call after I went to bed, which I declined from my watch, which then resulted in the app crashing. All of these factors don’t make me want to pay you a crazy $9.99 per month. The only reason I use the app at all is it is the only app that works with my company health program for sleep tracking. Otherwise, I’d delete it immediately.

Useful and easy to use but not perfect

I practically use this app every night. Helps me have a more relaxing wake up while still waking up on time. Highly recommend for anyone. For issues I have: sometimes the dial to set the alarm won’t move, I wish there was a setting to turn off the heart beat monitor, and I wish there was an option to track my sleep without the alarm

Was Skeptical- but it works

Really does show sleep cycles. If you have a sleep disorder, this app will tell you how good your sleep was by making changes in meds, caffeine intake, exercise, herbal supplements, etc.


Works great ! Yes

Works good but...

i have used this app every day for all of high school. so about 4 years now. always loved it, always trustworthy.. however, this year i have noticed it hasn’t been going off a lot. I was SUPER late to school one day because it didn’t go off. last night i set my alarm and it didn’t go off.. not sure why this is happening, but please fix. i don’t want to have to stop using this app.

Love it!

I use it simply for the alarm. I love how it gently wakes you up. I also love the option of sounds-- I use them when I can't sleep or if I have a bad dream or wakeup and can't fall back asleep. I've also found the tags to be beneficial due to the fact that I can see how my habits affect my sleep! Love it!!

Now. Requires motion,location and background App.rwfesh

Background refresh All.battery wasters. Why do they need location while you sleep? That's creepy. So then you sleep bathed in cellular signals. Can't put phone on airplane mode. This is since latest update may 2018 Bye bye

Extra crap

Why is it doing all this extra crap. Changing volume, launching sites you can’t exit out of. Weird screens just pop up for no reason?

Where is vibrate??

This has been my go to alarm for years. I give it a 4 star because they took the vibrate away. Bring back the option to add vibrate as alarm and I'll change to a 5 star.

At peace!

Started using this app for a class I was taking and have continued since. It has helped me understand my sleep better through the use of the graphs and its recorded my movements and heart rate and let me know how much sleep I was getting. It’s accurate and I would recommend anyone to use it for a better nights sleep and getting a peace of mind.


Very good

Great Alarm Clock and Sleep Analyzer

I only use this app for those two things. It is definitely good for these, but the other apps tend to be more annoying, and some apps tend to block it from functioning. Just remember to use airplane mode before using this app under your pillow. I do this, and this ends up making the ads blocking the alarm clock more difficult to remove. Please try to limit the amount of ads for the clock segment.

Too many ads

So many ads that it is not worth using anymore. I used to use this app every night and did not mind loading an ad after setting the alarm. Now there’s an ad for the paid subscription that you cannot get rid of.

Stop Freezing

This app needs to stop freezing resulting in my sleep hours not being tracked. I have this app connected to a wellness program and I’m missing points because Argus has been froze 3-4 times resulting in my sleep hours not being tracked so I can receive my points.


This is a fantastic app that very reliably lets you set an alarm while giving you a real time indicator of how much sleep you’ll be getting. The log, when consistently used, gives you a good indicator of how much sleep you get over a certain period. While it’s a nice idea to sleep with it in your bed because of the accelerometer keeping track of your tossing and turning, I find it to be kind of restricting when I charge it while I sleep, as well as being a temptation to browse the Internet instead of sleeping. If you’re like me, and knowing the ins and outs of your REM cycle aren’t a big deal to you, when on a side table the alarm works just fine. The song gently raises in volume, isn’t jarring, and isn’t a ring tone that will ruin your day if someone’s phone randomly rings with the same chirp. (Is that just a me thing? Because I’ve definitely had that happen in years past.) My only qualm is that it can be a bit annoying to have to circle via touch a time clock to get to the time you’d like, down to the minute. I’d love a manual function that lets me just input a time, but that’s just a nitpick. I have a slight hand tremor, and yes, while it seems a bit whiny, sometimes I’d like to wake up at 8:15 and not 8:12, thank you very much. Three minutes makes a difference! Other than that amazing app.

Too much noise

Used to be a great app. Too much hardcore marketing to get the $30 subscription. Not worth screwing with. Too bad.

Even the free version is handy

I use it nearly every night. Well designed app.

Love it!

Great way to wake up feeling rested.

Sleep Time

Works just as advertised. I like waking up gently inside of an alarm that makes you jump out of bed. It makes a difference in my energy for the day. Recently, another app advertised called Argus with a red flag with a "+" over it, since then it has blocked the sound control. I even downloaded it to get rid of the flag, but is still there, annoying flag in the way. Too many ads wanting you to buy


Sleep Time 5.144 is broken on my iPod Touch 5G running iOS 9.3.5. I get a message in a red bar near the bottom saying, "Sleep Time Free is not tracking because Location is off." All Location services are enabled, and I can't clear the message or see my sleep results in the morning. SAD!

Annoyed to death

I’ve been using this app on Android for years. I recently switched to IOS and this app is the first casualty. SO MANY ADDS. Video adds when you wake up, video adds when you go to sleep, etc etc. talk about waking me up abruptly, and a terrible thing before bed. If I could pay $5 and get rid of them I would, but there is a 0% chance I’m paying $100 a year for something this simple. Update your pricing and you might get some traction. Lose the video adds and you might get some users.

I’ve been using it for years

In that time, it’s barely changed, and it works fine.

Works great for me

Basic version works great. Try it you’ll like it.

The Best Alarm in the App Store

Best alarm ever. I’ve used it literally for years now. I love how gently it wakes you up. I start my days way less cranky now!

Daily affirmations

This app very clearly provides sleep behavior feedback and helps us learn what changes in our sleep habits work and what don’t

Wonderful dependable app

I have used this app for several years and love it.


UPDATE 4/18/18: I’ve been using this app for a few years and in the past few weeks it stopped working. I set the alarm before bed, gentle waves playing, and NO ALARM goes off in the morning. I uninstalled the app and reinstalled and still, no morning alarm. I’m no longer using this app, I need to have a reliable alarm in the morning.

Please fix your app

I have been using this app for years and over the last few weeks things have gotten super buggy and frustrating. In order to turn off the sleep tracker in the morning you have to press the appropriate button for 3 seconds and this is not working. After tracking all night, the app freezes and will not end the tracking so it has to be shut down and loses all the data. Please fix it...


I wanted an app that actually counts the hours of sleep I’ll get depending on the time I go to sleep. I hate counting it in my head. This is eazy peazyyy 👌


~ I cannot check my heart rate after I wake up because the camera strobes a couple times and then cuts off. ~ I can't control the volume. I liked that I was able to control how loud the white noise is when the pre-alarm goes off. Now it just blares at full volume no matter what. Sometimes the white noise doesn’t work at all and I use a different app for that now, but this apps volume still makes the volume of the phone blare when the pre-alarm goes off so, same problem. I’m not complaining, I love this app. I’ve had it for years and I love Argus and all you do for health monitoring, but just a friendly reminder from a loyal customer to please make sure all your apps are up to date.


The developers have rendered the app useless trying to get you to upgrade from the free version.

Alarm stopped working

I’ve been using this for about 3 years or so. Loved it because it woke me up slowly. However recently, the alarm has not gone off at all!! Causing me to be late. I can’t be worrying whether my alarm will go off or not, or I won’t be able to sleep well. The ads are annoying, but I could deal with that. However now I have to find another app.

Loud jarring ads

App works great, but after you wake up, it takes your heart rate. THEN IMMEDIATELY WITHOUT WARNING BLARES A LOUD ADVERTISEMENT WITH NO OPTION TO MUTE!!! It is a terrible way to wake up.

Too many adds

I finally gave up with this one. It kept crashing at night so it wouldn’t go off in the morning. You have to leave the app open without locking your screen for it to work. I liked that you could flip your phone over for the snooze, I will miss that. But there at least one add you have to watch before setting the alarm each night.