Whilst lying awake the other night, I became bored with counting sheep rolling over a cattle grid.
I came up with a more interesting alternative.
You have a patch of lawn in a sunny spot and one of those forked hand weeding things. You weed this patch. You can count the weeds if you wish.
As my weeding progressed, the weeds got weirder and weirder ( but that's my problem).
I woke up next morning, so I must have slept.