We are still on this journey in this verse. To sleep on a journey could he hazardous.
If we get very sick, we may be sad and anxious about what will become of our family. There are legitimate sources of anxiety. But we do not have to be terrified out of our wits. Because if we know the Lord, and have found him, and walk with him, we know that we are in his hands, we cannot leave this life, before the moment that he has determined, and then we go to the greatest adventure possible for any human being, from time into eternity. We go into the presence of Almighty God, and the wonders of eternity. The Lord is with us, we do not have to be terrified – what shall I do, whatever will become of me, what will happen to me next? We do not have to go through life shaking like leaves because we have the Lord and we seek his blessing, and we commit all things to him.