Are you often awake in the middle of the night and growing weary of the tiredness?
The lack of rest feels like an enemy, and to some extent, it is. The dysfunction of a fallen world guarantees that we will never have quite enough hours in the day, that our bodies too often won’t cooperate with our desire for rest, and we will feel our physical limitations deeply.
Sleeplessness can leave us vulnerable to temptation and weakness. Modern pundits tell of the consequences of accumulated restlessness on the mind, body, and soul. God has designed our bodies to need rest; the gift of sleep reminds us that we are not sovereign, that we are not omnipotent, but that God is both of these, and more, to us his children.
The gift of sleep is really a gift of dependence, an invitation to trust the God who “will neither slumber nor sleep” (Psalm 121:4) and who “gives to his beloved sleep” (Psalm 127:2). My sovereign God has ordained every night of life just as he has ordained my days. He is the author of the number of times I wake each night, just as he is the author of each one of the days of my life, be they blissful, benign, or “bad.”
Sleeplessness causes us to look away from ourselves — our capacity, our resources, our energy reserve, our mental acumen, our physical strength, and our careful planning and scheming — and it causes us to rely solely on him who “does not faint or grow weary” (Isaiah 40:28). It is there, in the middle of the night, that we find ourselves coming to the end of ourselves. And the end of ourselves is a very good place to be. We will find we are not all-sufficient, that we cannot provide what we need to get through the next day.
God himself is the only All-Sufficient One. He always has been. He always will be. He brings sleeplessness into our lives so that we will remember this. In this place of exhaustion, we find God’s grace to be ever present. 
Even youths shall faint and be weary, and young men shall fall exhausted; but they who wait for the LORD shall renew their strength; they shall mount up with wings like eagles; they shall run and not be weary; they shall walk and not faint. (Isaiah 40:30–31)