Claude spends hours on 8 years of Fitbit data to conclude: staying up late means less sleep

GaryMarcus · x · 2026-08-24

A user fed 8 years of Fitbit data into Claude, which spent a couple of hours analyzing it for correlations. The model's key finding was a tautology: staying up late results in less sleep. The result was shared as a humorous example of AI over-engineering to reveal obvious truths.

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