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I'm a big fan of this free android app: https://play.google.com/store/apps/details?id=com.lslk.sleep...

Among other features it records noises, cuts out all the no-noise moments and you have a 3-5 minute record of all nightly noises in the morning. As others have said here all the expensive gadgets are mostly random number generators so I don't see the point in wearing one - this app had told me a lot about how I sleep, what disturbs me, etc.

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