
Hi Sandie
Yup thats me :D, we tried various things that the vet suggested, which were mainly distracting her someway, with tidbits and games, but unfortunately nothing is more interesting then shadows, although I have to say as she gets older (she's now 15 months old) she seems to be getting slightly less interested in chasing them.
We've found walking her at night to be a pain like your self, so we invested in a torch that can be adjusted to show a very wide beam, so after a minute or two she forgets about the light.
At night she was a real pain in the you know what when we we're watching TV, so now when she starts we shut her in the hall for five minutes, and that seems to have tempered her need for chasing shadows on the TV.
The vet did suggest seeing a behaviourist but we decided to put up with it and hope she eventually grows out of it, and thinking about it she's not nearly as bad as when she was 6 months old.
I'm sorry I can't be more help, and I do sympathise, it can be really annoying some times when your dog is bouncing around pulling your arm off on the end of a lead, and when your sitting quiet and theres constant thudding as her paws hit shadows on the floor.
One consolation though she seems very happy judging the speed her tail is wagging all the time.
Robert