> ## Documentation Index
> Fetch the complete documentation index at: https://docs.junction.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Polar

> Understand Polar integration limitations where historical data backfill is only available for sleep and sleep stream resources.

## Historical backfill with Polar

Polar, unlike most other providers, doesn't offer historical data for most of its resources.
The only resources that do have it are Sleep and Sleep Stream - 28 days each.