Alarm clocks are thick on the ground on the Google Play Store, which is surprising in itself, since Android has a perfectly capable alarm clock built in. There are popular alternatives like DoubleTwist's slick-looking Alarm Clock, and various options for softly lulling you to sleep with music. Now there's a new option that's become quite popular on iOS (though we won't hold it against them), which uses your smartphone or tablet's sensors to wake you up at the right time. Sleep Time Alarm Clock is a free download, and it's compatible with just about everything out there.

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Sleep Time Alarm Clock uses cycles in your natural circadian rhythm to wake you up when you're most likely to feel refreshed, instead of set moment when you may be in your deepest sleep. This can make the difference between jumping out of bed or falling out of it. To detect when you're in your lightest cycle of sleep within a 30-minute wake up window, Sleep Time taps into your phone's accelerometer while sitting on your bed or beneath your pillow. Users who try this method have mixed results (I've never been able to get it to work for me), but there are plenty who swear by it.

The app comes from Azumio, creators of the popular Instant Heart Rate. The app is undeniably beautiful, combining the subtle Holo theme with bright colors and animations. Setting the alarm itself is done in a novel fashion: just swipe your finger around the clock to set it. I must admit, it's a lot more intuitive than the native up/down arrows. After your first night of sleep, it'll even report on your sleep cycle for you. If you're looking for a new way to wake up (or just a pretty alternative to the default alarm), give Sleep Time Alarm Clock a try.

Jeremiah Rice
Jeremiah is a US-based blogger who bought a Nexus One the day it came out and never looked back. In his spare time he watches Star Trek, cooks eggs, and completely fails to write novels.
  • Gloria Tortorella

    I've been using "Sleep as Android" for ages and it works pretty well but this one looks much more polished, I'll give it a try thanks! :D

    • Jörgen Pettersson

      Although Sleep Time - Alarm Clock locks really slick, Sleep as Android combined with SleepStats provide a lot more statistics. On the downside the app looks like crap! :)

  • ari_free

    hmm I don't want to put my phone on my bed. It will probably drop to the floor long before morning.

    • http://twitter.com/tomdwright Tom Wright
      • Jörgen Pettersson

        With that thing the sensors won't be able to monitor your movements.

        • http://twitter.com/tomdwright Tom Wright

          I am not advocating the product, merely highlighting its existence. But given the fact that it would be in physical contact with your bed, and is designed specifically for this purpose, one presumes the sensors would be able to.

  • http://www.facebook.com/mark.gjodvad Mark Arpon Gjødvad

    But at night I charge my phone? It'd be quite a hassle to sleep with my phone in my bed while it's charging...

  • Logan B.

    I'm with Gloria. I've been using "Sleep as Android" for almost a year now. Does the same thing, unfortunately it's a paid app. I'll definitely keep this app in mind if other people are looking for an alarm clock like this.

    For everyone else, I've never had an issue with the phone calling off the bed. Even when I'm in a twin-sized dorm-room bed. I also keep my phone charging through the night too, still works like a charm to just have the phone near the side of the bed, and I move around a lot when I sleep.

  • PhilNelwyn

    What if you're not alone in the bed?
    How do the sensors track only your moves?

  • Elias

    Good thing if this had the option to use also the mic. I'd rather not sleep with my phone, I'm prone to unplug its power cord, and beginning the day with a discharged 'droid ain't good.

  • allen

    Do you sleep with your smart phone? Then take a look at http://www.smartphonesleeper.com THe first and only Smart Phone Holder made for the bed.

  • Jachym Kokesh Lukes

    I'm using this one on my company iPhone for some time now. I leave it under the pillow, as I am afraid, that I will push the phone away from my bed, or that it would be uncomfortable to sleep on it directly. It actually is surprisingly good, if you let it wake you up to 30 minutes earlier, if it detects lighter sleep prior the wake up time. If that happens from time to time, I feel like it is easier to wake up + I have less stress running around the house, as I have more time before leaving for work.

  • http://www.gadgetsalert.com Mōhsïn Ahméd Sïddïquï

    best alarm app :)