Deep inside he knew what had woke him up, and caused that cold sweat materialize on his forehead. He held his breath and listened. The only thing he could hear, out of the compact darkness, was his heart beating, hard and fast. Once again he heard the razor-sharp shriek, striking against the inside of his ears and he closed his eyes so hard, it almost hurt.
Even though he hadn’t heard that sound for years, he knew it far too well.