I have a similar experience back when I was still 9 years old.. Back then my imagination is so wide. It was, as far as I can remember, in the middle of the night, everyone is already fast asleep, and I was the only one left awake. I can see different scary shadows outside the window, and what scares me a lot is that they seem to move and get closer to me.

Only then I realize that it was just the shadow of the tree, when I woke up the other day.