Wearable Temperature Analyzer

No. Your CSV is parsed and analyzed entirely in your browser. Nothing is uploaded to a server or stored in a database. If you close the page, the data is gone.

It groups your nights by bedroom temperature and shows which range had your strongest recorded sleep metrics. It does not prove that a temperature caused a result — many other factors affect sleep. It's a starting point for your own experiments.

At least seven nights with both a bedroom temperature and at least one sleep metric. More nights and more spread across temperatures make the pattern more reliable. With too few nights in a range, the tool says so rather than forcing a conclusion.

Yes. Most wearable exports include a date, a sleep score, and sometimes heart rate variability and sleep staging. After uploading, you map your columns to the fields the analyzer expects — different apps use different column names.