Silent alarm clock

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Silent alarm clock.

Wake gently and silently. Dynamic vibration gently nudges you awake without bugging anyone else. Wake up more naturally instead of alarmed.

Automate your sleep journal. Compare and track improvement over time, tag the factors that are affecting your sleep, set sleep goals for each night, and get data you can easily share with your doctor.

Find ways to sleep better

The 7-day sleep assessment and lark pro trial with coaching from our sleep experts helps you find out what kind of sleeper you are and how to improve.


Silent alarm clock

  • snooze setting

  • time in bed calculation

  • back-up alarm

  • bluetooth connectivity

  • dynamic vibration

Sleep tracking

  • actigraphy tracking

  • automated sleep journal

  • sleep data summary

  • trigger tagging

  • sleep notepad

  • mood tagging

  • online portal

  • benchmark comparison


Tracking technology

Using actigraphy, lark tracks millions of micromovements every minute in order to calculate how long and how well you've slept each night. Actigraph units use accelerometers and timers to track your sleep patterns. Wear it on your non-dominant wrist for best results.

Vibration technology Dynamic vibration technology was designed with top sleep experts for a wake up experience that feels like you woke up naturally. lark’s gentle vibration can reduce heart rate variability, stress levels, and blood pressure spikes, all of which are known to cause that awful groggy feeling in the morning.

  1. Silent, vibrating alarm clock. Dynamic vibrations wake you gently each morning, and nobody else.

  2. Bluetooth transmitter. Automatically sends your sleep data to your mobile device and online portal.

  3. Intelligent accelerometer. Uses actigraphy to tracks thousands of micro-movements each night.

  4. Comfortable and adjustable. Soft, breathable and adjustable to any size wrist for pajama-comfort.



  • Length: 11.25 in / 28.5 cm

  • Width: 1.375 in / 3.5 cm

  • Weight: 1 oz / 28 g

  • Color: Black

  • Material: Lycra

Sleep sensor

  • Width: 1.7 in / 4.3 cm

  • Length: 1.6 in / 4 cm

  • Height: 0.375 in / 1 cm

  • Weight: 0.8 oz / 22.7 g

  • Color: Black


  • Height: 1.5 in / 3.8 cm

  • Width: 4 in / 10 cm

  • Weight: 1 lb / 0.45 kg

  • Cradle width: 0.5 in / 1.3 cm

  • Color: Metallic and black

  • Cable

  • Type: Dock to Mini USB cable, dock to USB cable

  • Length: 6 ft / 1.8 m


  • Compatibility: iPod touch (3rd and 4th generation) iPhone 4S, iPhone 4, iPhone 3GS, iPad (3rd generation), iPad 2, iPad and above

  • System requirements: iOS 4.2.6 and above


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    Sleep Well, Have a more productive day

    May 28, 2013 by Linda Knight Recommended

    I really want to try this out. I am a epileptic and uninterrupted sleep is very important. How I wake up is also important.

    The silent alarm is great. It does not startle you but wakes you up gently and only you.

    It keeps a record of my sleep pattern. This is a bonus because i can show it to my doctor.

    It works well with my phone. If you have issues with sleeping or how you wake up, I would recommend this.

    I do not find any con's, only pro's for better health. You sleep better, the better your health.