Casio Sleep State Mode — What to do?

You ask: How can I restore normal watch operation from the sleep state?

Casio answers: Place the watch in a location where it is exposed to light, or press any button. If your watch is equipped with an Auto Light feature (automatically illuminates the face of the watch whenever it is angled towards your face, but only in the dark or when surrounding light is dim.), normal operation is restored by tilting the watch towards your face for reading.