Do Androids Dream of Electric Sheep by Philip K. Dick
I enjoy explorations of robots and the future interactions between humans and machines.
The title now has multiple meanings because in the book live animals are prized and expensive possessions. Those who can't afford the real thing sometimes buy robotic versions, like sheep. So, humans dream of aquiring real animals, machines might desire something analogous (and, of course, there is the link to counting sheep while trying to sleep).