Watching Bears Scratch Themselves is Entirely Too Amusing

In either case, in terms of giving the mouse some exercise: mission accomplished!

Sadly, I think this is actually a medical or psychological disorder... First few times it was funny, but eventually I'm like "poor fellow...".

Ear infection is a common cause of this kind of behaviour, you can see by the distinctive head tilt. It could be trying to use the wheel, but is too disoriented and keeps missing it. Recommend hydration and a prescription of antibiotics. Unless it's a brain tumour, inbred white mice get those sometimes and there's naught you can do about it.