Regophelia
When you're going about your business reading a book and there is a sudden realisation that the last few pages you have read haven't actually registered in your mind. You're looking at words but they're not actually going in, but at the same time you aren't realising they're not going in. A scary phenomenon so named regophelia
A scary syndrome, regophelia can strike at the most inopurtune times and catch all readers off guard if they aren't careful