EnableIffSleeping.cs

using UnityEngine;

namespace Unity.AI.Navigation.Samples
{
    /// <summary>
    /// Enables a behaviour when a rigidbody settles movement
    /// otherwise disables the behaviour
    /// </summary>
    public class EnableIffSleeping : MonoBehaviour
    {
        public Behaviour m_Behaviour;
        Rigidbody m_Rigidbody;

        void Start()
        {
            m_Rigidbody = GetComponent<Rigidbody>();
        }

        void Update()
        {
            if (m_Rigidbody == null || m_Behaviour == null)
                return;

            if (m_Rigidbody.IsSleeping() && !m_Behaviour.enabled)
                m_Behaviour.enabled = true;

            if (!m_Rigidbody.IsSleeping() && m_Behaviour.enabled)
                m_Behaviour.enabled = false;
        }
    }
}