When thoguhts become alive

Sometimes it happens just as think. I had the habit of sitting at the window turning my back against it so as to get light from behind while reading. Our old wooden window had a half curtain which I would never open since I get light from the above half. Few years ago one day as usual I relaxed with the newspaper in the mid-morning, suddenly this thought came to mind that a snake could crawl up from behind. I got up from the chair holding the paper in my hand and open the window curtain slightly and looked at the ground. I was taken aback to see a snake at the base of the window. As I drew the curtain it startled and held its head (not hood) erect. I don’t know what kind of snake was that. I stood silent as I could. In a few minutes it crawled away and hid under the stones that were heaped in the garden. Since then I gave up sitting in that position. My thoughts become alive like this often. I don’t know whether it is an intuitive power to protect me or there is something wrong with my brain.