Persuasion

  Sophie couldn't sleep.

So begins Roald Dahl's, The BFG.

  A brilliant moon beam was slanting through a gap in the curtains. It was shining right onto her pillow.
  The other children in the dormitory had been asleep for hours.
  Sophie closed her eyes and lay quite still. She tried very hard to doze off.

How many times have I done the same thing?

  It was no good. The moon beam was like a silver blade slicing through the room onto her face. 
  The house was absolutely silent. No voices came up from downstairs. There were no footsteps on the floor above, either.
  The window behind the curtain was wide open, but nobody was walking on the sidewalk outside. No cars went by on the street. Not the tiniest sound could be heard anywhere. Sophie had never known such a silence.
  Perhaps, she told herself, this was what they called the witching hour.

Roped in yet?

  The witching hour, somebody had once whispered to her, was a special moment in the middle of the night when every child and every grown-up was in a deep deep sleep, and all the dark things came out from hiding and had the world to themselves.

Trust me. If you haven't read the book, go do so before you see the movie, which comes out today. This is one movie I'm really excited about seeing!