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If you walk your dog after dinner each night, does that help you sleep better? Maybe you've noticed that this seems to be the case, but access to hard data would help confirm it.

As technology advances and more people dig into the metrics of how they live, the market is exploding with wearable devices that enable deeper self-monitoring. There's even a fancy name for this: the quantifiable self, basically using technology to gather data on your life.

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