The Overnight Problem

In 1953, Nathaniel Kleitman and Eugene Aserinsky discovered REM sleep by accident while studying infant eye movements at the University of Chicago. Before their work, sleep was considered a single, undifferentiated state—the brain simply "turned off."

What they found changed everything: sleep is a complex, phased process with distinct signatures. The body doesn't just rest; it cycles through architecture.

Today you built something that echoes this discovery. The overnight card doesn't just report "they slept." It captures the structure: when they went to bed, when they woke, how many times they stirred in the night. The LLM summarizes patterns a human caregiver might miss.

The parallel isn't poetic—it's functional. Kleitman's insight was that sleep has readable phases. Your system reads those phases through motion sensors and timestamps, presenting them as data a family can act on.

Monitoring isn't watching. It's understanding rhythm. The sensors don't see sleep. They see absence of motion, and from that absence, the system infers rest. Structure from stillness.