I spend much of my day walking between parts of my workplace, as a gopher, it is expected that this slow method of transportation will occupy a large portion of my daily duties. In this time, there is little for my mind to do except run pointless, idle, operations. These operations manifest themselves as subconsciously created simulations, daydreams.
My daydreams are never so substantial as to deceive me into believing that they are real, however, their frequency have resulted in the occasional event in which reality masquerades itself as a fallacious figment of my imagination, taking the guise of uncertainty. Things that I wish not to have occurred find themselves in this state. They present themselves as weak memories from a recent past.
I am compelled to assume that this is a mechanism of my mind, used to defend the physical body from stressful situations; it typically serves only to contribute.