Every night, Sleeptracker-AI analyzes millions of fully anonymized sleep recordings. This Halloween, the data showed a clear and measurable spike in resting heart rate across sleepers in the U.S.

The cause is straightforward:

• behavioral changes that activate the sympathetic nervous system, captured at population scale,
• increased sugar intake,
• higher alcohol consumption,
• later bedtimes,
• and elevated nervous-system stimulation all converge on the same night.

The Halloween signal is part of a broader seasonal pattern. Beyond the single-night holiday disruption, the data show a steady rise in resting heart rate throughout the fall. Colder temperatures, shorter days, and shifting routines place a cumulative, low-grade stress on the cardiovascular system that is visible across the full season.

Sleep data reflects how we live. The KOA Sleep-Science Agent makes the Sleeptracker-AI dataset of 250 million nights of sleep directly accessible for research — enabling exploration of recovery trends, activity patterns, and lifestyle shifts across the holiday season and beyond.

Do your own research with our Koa Sleep-Science agent. Leverage our dataset of 250 million nights of sleep to explore trends in recovery, activity, or lifestyle shifts—especially during the holiday season.

—> Access the Koa Agent:

https://koa.fullpower.ai/

Make your very own sleep-science prompts!

https://www.fullpower.com/

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