Rigidbody.Sleep

Description

Forces a rigidbody to sleep at least one frame.

A common use is to call this from Awake in order to make a rigidbody sleep at startup. See the Rigidbodies Overview in the manual for more information about Rigidbody sleeping.

using UnityEngine;

public class ExampleScript : MonoBehaviour
{
    private float fallTime;
    private Rigidbody rbGO;
    private bool sleeping;

    void Start()
    {
        rbGO = gameObject.AddComponent<Rigidbody>();
        rbGO.mass = 10.0f;
        Physics.gravity = new Vector3(0, -2.0f, 0);
        sleeping = false;
        fallTime = 0.0f;
    }

    void Update()
    {
        if (fallTime > 1.0f)
        {
            if (sleeping)
            {
                rbGO.WakeUp();
                Debug.Log("wakeup");
            }
            else
            {
                rbGO.Sleep();
                Debug.Log("sleep");
            }

            sleeping = !sleeping;

            fallTime = 0.0f;
        }

        fallTime += Time.deltaTime;
    }
}