Finding the Best Sleep Tracker

MacStories
By John VoorheesOct 23, 2025, 2:42 pm295 pts
Earlier this year, Andrej Karpathy wrote an in-depth analysis of four sleep tracking methods that Federico recently recommended I read. I’m glad he did, Karpathy, an AI researcher who has worked at OpenAI and Tesla, took the kind of nerdy, data-driven approach that I love. Over the course of two months,…

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