My cat, Holly, is currently camped on top of my DAW PC case, it never ceases to amaze me how cats can sleep on some places that look uncomfortable, but then again a Cat's skeleton is very flexible.
She was invading my lap a few minutes ago, have you ever noticed how a cat becomes demanding of it's owner's attention when it's owner is busy?
Spoke too soon, she just decided to invade my lap again....lol.