Something on the horizon

On the morning of yesterday I felt something gray looming on the horizon. I did not know it at that time. I turned my face away and went on. There was important work I had to do.

At about two o'clock of that afternoon, I felt that thing is still there, and this time was creeping quickly towards me. Then, I couldn't do my work well, so I left it immediately.

At about one o'clock in the next morning I saw that thing explicitly when it sat in front of my face.

Although that thing was without any features, but I knew it immediately, because it was not on the horizon as I thought, but it was inside me a long time ago.