By the time most people wake, a great deal has already been done on their behalf. Bread baked at four. A bus driver on a second circuit. Somebody at a substation making sure the lights come on. A day arrives fully assembled and unbilled, and it comes with hours in it that nobody has claimed yet.
Fear reads empty hours as risk — all the things that could go wrong inside them. The same hours read another way are simply unassigned. Assign one to something you actually want, before the day gets spent for you.