I’ve been logging my sleep patterns since about 2012. The Android app I use to collect this data is fine as a collection tool but is terrible as an analysis tool. I only ever really look at the past week or two of data. All the old data is backed up to their servers, accessible with OAuth2, and can be downloaded in .csv form. I should set up some kind of script that pulls my logs down regularly and displays it on this site somehow. I bet there are a lot of cool JS libraries for displaying data in cool ways.