"Zum Schluss sind wir nur noch total muede ins Bett gefallen. Ab jetzt nur noch mit Navi!" (Context: The speaker and her friend were in a foreign city and could not find the way back to their hotel.)
What does noch mean in these sentences? I think in the first sentence it expresses the idea that falling into bed is one more thing they did after having done other things. But I'm clueless about why it's used in the second sentence at all.