Self-Iteration

When they knock on the door After my first parallel universe jump, I found myself trapped in an infinite loop of the same day. What's even more frightening is that I discovered that it was not time that was looping, but my consciousness. In each universe, I thought I was the original, until I received a warning from my "previous self". Today, on the 73rd cycle, I received a note: "One of us is not human." But this time, the physical constants began to show slight deviations...