At launch, Sleep Sensing on the 2nd-gen Nest Hub was available as a "free preview" that was later extended to 2023. As 2024 starts
Google Nest Hub Changes (2024) - GadgetMates
Sleep Sensing, an effortless way to track your sleep - Google Store
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Sleeping with the Google nest hub - EDN
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Google Nest Hub (2nd gen) review: Cheaper, better, with sleep tracking