How to set up custom gravity force and get the rigidbody to sleep as usual?

I get to replicate the gravity force like : mesh->addForce(gravityValue*mesh->GetMass() . The problem is that that rigidbody never sleeps.

Is there any way to make it behave like a usual rigidbody and get it to sleep when not moving even when I am aplying a force? How should I approach this?

Bump!!! Anybody?

bump! please help