Aaron,
What I notice at bedtime if my eyes are real tired...
I'll still see the bi-focal area of the lens when I first take my glasses off...
More so if the lights are off or my eyes are closed.
Now that I'm no longer self employed and working 20+ hours each day, I haven't noticed it as much.
About the only thing that makes my eyes tired now is welding for an entire shift and that's only happened a few times in over a year now.