In my game, in order to upgrade level, the objects (rigidbodies) have to be stopped.
I have a function that returns true if all the objets are sleeping (stopped).
This works fine in Unity 4 but, I’m upgrading my game to Unity 5 and it seems that my rigidbodies even when they are stopped the function “myObject.GetComponent().IsSleeping()” is always returning false, which is wrong. I know this by doing a debug log.
Since the new version, I’ve noticed several small oddities with Physx and my guess would be that you have to adjust the sleep threshold in the physics manager: Edit/Project Settings/Physics. You very well could have tried this, but I do know the newer version of Physx has differences in scaling that has required me to refactor some of my code. Hope this helps!