My NAS started to hibernate, but not without some extra configuration steps. Thanks for a link. It is helpful. I would just suggest 2 changes, as extra hints:
1. "Sync logging may also be a factor preventing your NAS from sleeping. To disable logging, create a debug.txt file in the storage folder and type "0" in it."
It is not that obvious how and where to create debug.txt file, especially on NAS where you don't have a direct access to the system folders. Disabling "Enable debug logging" option helped me partially, preventing logging "Tracker requesting peers" every 5 minutes.