I was encouraged by this theological refection by
Tony Reinke on Sleep.
Sleep is a perpetual reminder of our finiteness. Every 14-18 hours or so (depending on the person and depending on caffeine intake), our bodies have to shut down and be refreshed in order to survive. It doesn't matter how strong or resilient a person is, no one can survive without sleep.
Sleep is one of the things that sets God apart from human beings. God's word says that God never sleeps (Psalm 121:4). Think about it, the God who cares for you has never been drowsy, has never had bed head or morning breath, because He has NEVER EVER slept. Whether under the light of the sun or moon (Psalm 121:6), God is always caring for us.
Amazing! So sleep then should be an act of worship in which we regularly cease from our own efforts and rest in the care of He who "does not faith or grow weary" (Isaiah 40:28).