@ecwilson Apologies for the delay - just noticed your question.
We've tested it extensively internally and we have many users who don't sleep alone use the app and report it's working great. The app is being able to an extent adjust and isolate secondary movement, especially on firmer mattresses.
Interestingly, cats seem to be a bigger problem when it comes to interfering with tracking! :-)
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Been a huge Sleep Cycle fan so I'm going to have to check this out!
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Algopro
nēdl (as in, 'the haystack')