Die Sandmanzen

What happens in the sandpit when all the children have gone home for the evening? Nothing? If you were to wake up and go to see for yourself, you would be surprised to meet the sandpixies Agatha and George there, both of them entirely made of sand. During the daytime the two of them sleep curled up in the sand, indistinguishable from their surroundings and invisible to people. But if you stay very still and listen carefully, you can hear them snoring softly under a small mound of sand. (Anifilm)