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.

FEATURES

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
  
  

DESIGN & TECHNOLOGY

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.
   
   

WHAT'S IN THE BOX

Wristband

• 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
  
  

Dock

• 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
  
  

App

• 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