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, Karpathy plotted sleep tracking results from: an Oura ring a Whoop fitness band an 8Sleep Pod 4 Ultra smart mattress cover the Apple Watch running the app AutoSleep Karpathy got the best res...
