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The brand new device makes a big promise: It’ll help you sleep better. Yet whether people will actually use the device — and whether doctors will trust it — is still an open question.

Beddr, a startup based in California, announced Thursday its device, the SleepTuner, is officially on the market. For $149, users can stick a small device on their foreheads equipped with an accelerometer and a light sensor to track oxygen levels, the number of times they stop breathing each night, and how many times they wake up.

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