When I was a child I heard the 'adults' talking about 'someone' whose child had had a Night Mare.
What a mystery that was to me. They made it sound terribly awful.
I knew better.
A Night Mare was simply a magical horse who appeared when you where very tired and on the edge of sleep.
She knocked at your window and offered to take you on a ride.
You only needed to hang onto her black silken mane and lean close as she whispered wonderful secrets and showed you the moon and the stars.
Of course she flew with the night sky and a child's dreams of wonder.
...and always brought you somehow, softly back to awaken with your head on your pillow.