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From Fellrnr.com, Running tips
→Alternatives to Zeo
* The cheapest are the simple apps that use a smartphone's accelerometer to measure movement and thus evaluate your sleep. It's not clear how well these apps work, and are likely to be dependent on the type of mattress you have, if you sleep alone or not, and the placement of the phone. On the other hand, they are remarkably cheap.
* The LARK uses a movement sensor that straps to your wrist and connects to a smart phone. This gives far more accuracy than simply relying on a smartphone on your mattress. The price is more expensive than the Zeo, with the LARK Pro costing $159. There is a cheaper version at $99 that does not include the ability to track sleep. More at [http://www.lark.com/].
* Gear4 Renew SleepClock has a different approach, using radio waves to detect movement and [[Breathing|breathing]]. It's more expensive than the Zeo at $199 and there is no supporting research about its accuracy. More at [http://uswww.gear4.com/product/_/410426/renew-sleepclock/ gear4.com]
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