Problems to change text from a child in a child

Hey guys, I have problems to change a text from a child of a child of another object

This is my hierarchy:

My script is attached to the "Schlafsack(Clone)" and I have to change the text from the Tooltip child "Text".

This is the Code I tried but it didn't work.

using UnityEngine; using System.Collections; using UnityEngine.UI; using UnityEngine.EventSystems;

public class Schlafsack : MonoBehaviour {

 SpielerWerte spielerwerte;

 float distance;


 GameObject hud;
 GameObject tooltip;
 Text text;

 // Use this for initialization
 void Start () {
     spielerwerte = GameObject.FindGameObjectWithTag("Player").GetComponent<SpielerWerte>();
     hud = GameObject.Find("HUD");
     text = hud.transform.GetChild(5).GetComponentInChildren<Text>();
     //text = tooltip.transform.GetChild(1).GetComponent<Text>();
 }
 
 // Update is called once per frame
 void Update () {
     distance = Vector3.Distance(GameObject.FindGameObjectWithTag("Player").transform.position, this.transform.position);

     if(distance < 5){
         text.text = "Press E to sleep in Sleepingbag";
         if(Input.GetKeyDown(KeyCode.E)){
             spielerwerte.sleep = true;
         }
     }
 }

}

Thanks for help :)