This is a full source for the Garmin watch integration for Sleep as Android by Urbandroid Team. The repo contains both Android part and Garmin part. Contributions are welcome as well as any inquiries!
Android part (distributed on Play Store as Sleep as Android Garmin Addon) can be found under /android.
The Garmin watch app (distributed on Garmin ConnectIQ store as Sleep as Android) can be found under /garmin.