Storytime It's A Secret

Do you have a cat? Does it go out at night time? I had a cat called Harpo and she always went out at night when it was our time to go to bed, I presumed she just went asleep in her basket in the shed..........but maybe not.
Do you wonder where cats go at night? Or any nocturnal animal? What are they all doing while we sleep? This book has a crazy idea of where they go!