Try this and attach it to the marble, so it wakes up the rigidbody:
function FixedUpdate()
{
rigidbody.WakeUp();
}
[Rigidbody.WakeUp][1]:
There are settings in edit-->proj settings-->physics that control when a rigidbody falls asleep (min velocity, min angular velocity, etc) but they seem to glitch too often to be reliable.
[1]: http://docs.unity3d.com/Documentation/ScriptReference/Rigidbody.WakeUp.html
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