A Quirk Of Memory

I seem to be having some cognitive issues lately, primarily in terms of visual recognition and short term memory retention. I can start a task, get distracted, leave it incomplete for hours (while convinced that I probably did finish it), then realize that I didn't remember finishing it off. Other times, I can read something, and comprehend it entirely wrongly. For example I could read numbers and not remember some of them or reverse their order, read letters entirely wrongly and similar misunderstandings.

What is interesting is that there is nothing wrong with my visual acuity. If anything, it's generally above average in anything but bright lighting conditions. However, just because I can see something doesn't necessarily mean my brain would process it as exactly what I see. I comprehend by reading inside my mind, and what comes out is what I understand as the message. Unfortunately, it seems that I have developed a propensity towards scrambling that message. Or dropping the signal entirely.

3 possibilities: I'm getting senile, developing ADHD, or am just plain sleep deprived from the punishing daytime schedule. For the sake of what little remains of my sanity and the general feeling of being totally messed up from having to be up through the daylight hours, my bet would be sleep deprivation. Note to self: It may be better to make sure parents don't shake me out of bed on weekends.