Kirsten, I agree with what the others have said. My cats have always had access to my garden although I have NEVER allowed them s to go out the front of the house even though I live on a very quiet street - and they somehow know that they are not allowed. They are smart and even though they are a law unto themselves, they can be 'trained' and they do understand (although they would like us to believe otherwise!), so I guess that Luna and Lily understand by now that they live inside. I think that cats are intelligent and they need stimulation particularly when indoors. Lulu has not been outside for about 2 months now as it is cold but she has made that choice herself. She is demanding of my attention partly because she is bored because when she goes out in the warmer weather, she is very busy amusing herself in the garden and doesn't demand so much from me. Perhaps you could hang a curtain somewhere in your apartment that you wouldn't mind her climbing? Cats do climb trees and when they do this outside they use a lot of energy. I guess Lily is expelling energy when she behaves in this way. There is a toy called Panic Mouse which is pretty good - I have one for Lulu. Anyway, good luck and I think the natural remedies are a good idea.