From Sara Faye Lieber's essay Bohemian Rhapsody in the lit magainze Guernica:
Sleep is an anchor. It is a beginning and an end. When we are robbed of sleep, by stress or pests or other predators, we lose the punctuation that separates the tape of the everyday into manageable portions. Regular sleep provides a stop, a temporary ending that is necessary for there to be a new beginning the next morning. Without this prolonged pause, the insomniac’s experience of the world becomes oppressive, involuntary, a ride one remains strapped into against her will.