The thug in my avatar has feline asthma and the initial treatment was steroid injections every month. He was a greedy cat to start with and the injections made the situation much worse.
I tried feeding him just before bed, locking him out of the bedroom, shooting him with a water pistol when he tried waking me - the list goes on.
Needless to say he won the war.
I opted for a much more expensive treatment and he has to use his inhaler twice a day. I have to bribe him to do this - cat sweets.
If your cat is going to be on the injections for a long time you might consider buying something like this -
http://www.kongcompan...cats/treat-dispensers The idea is to stuff it full of sweets and let them chase it around the house - he gets exercise and some sweeties too.
Good luck - as a cat slave you already know how devious they can be.
;-)