Psalms 63:5,6

My soul shall be satisfied Not only as with bread, which is nourishing; but as with marrow and fatness Which are pleasant and delicious; namely, when thou shalt fulfil my desire, and bring me to enjoy thee in the sanctuary; though now in my exile I groan and pine away for want of that mercy; and my mouth shall praise thee with joyful lips I will praise thee openly: I will confess with my mouth as well as believe in my heart: and I will praise thee cheerfully, from a principle of gratitude and holy joy. When I remember thee upon my bed During the solitude and stillness of the night; a fit season for meditation on the daily repeated and long-continued mercies of God. David was so full of business all day, shifting for his own safety, that he had scarcely leisure to apply himself solemnly to religious exercises; and therefore rather than want time for them he denied himself his necessary sleep. Hebrew, upon my beds, implying that he was frequently obliged to change his bed and lodging, being driven from place to place. In the night watches In the several seasons of the night, which were divided into three or four watches. When others sleep securely, my sleep is interrupted by perplexity and grief, but my thoughts are fixed on thee. David was now in continual peril of his life, so that we may suppose care and fear often held his eyes waking, and gave him wearisome nights; but then he entertained and comforted himself with thoughts of God and things divine. So ought we to do when sleep departs from our eyes, through pain or sickness of body, or any disturbance of mind.