The problem with the sleep mode is unless one watches or records the front LED there is no way to know for certain for how long the My Cloud is going to sleep mode and remaining in sleep mode.
One can use Rac8006’s Sleep.AWK script to get a more detailed idea of how often and for how long their My Cloud is actually sleeping.
https://community.wd.com/t/new-sleep-awk/153431
There are several services one can stop to try and improve sleep time. However, disabling or stopping those services will affect certain My Cloud features like being able to search using the WD mobile app or the creation of certain image thumbnails for files.
Here are several threads that discuss various methods to improve sleep time with mixed results.
https://community.wd.com/t/mycloud-wont-sleep-after-update-help/96645
https://community.wd.com/t/mycloud-does-not-go-to-sleep-standby-perhaps-the-solution/158591
https://community.wd.com/t/this-resolved-my-cloud-sleep-mode-issue/157059
