Have you ever woken up in a state of panic? Maybe it was because you were particularly tired. Maybe you were sick. Maybe you were travelling and not in your own bed. It has happened to me a few times and nothing is more unsettling then being confused about where you are. I remember one time being in a cottage near Huntsville and waking up in the middle of the night to complete darkness. It was so dark I felt claustrophobic. It made me want to go home and get my trusty Snoopy nightlight!