Last year what started happening was that I would be reading in bed and suddenly wake up as my book dropped on the floor with a bang. What was happening was that I was putting my book further and further away from eyes in order to read it better. Before, if I had fallen asleep my book would just drop on to the bed.
I only realized how bad my eyes had got was when a friend lent me her glasses to read a menu and suddenly every thing became crystal sharp.
I am not surprised if little kids don't realize their eyes are getting progressively worse - I'm old enough to know and didn't realize it for myself.