These two are crazy! They run laps around the couch. At the end of the night they both sleep pretty well. I just need to find out how to get Leo to get along with the other kitties. He sits by their door and growls and hisses and Midnight's on the other side meowing and purring.
Do some scent swapping, take something that Leo lays on (or just rub a towl over his fur) and give that to your cats. Then take a towl and rub it on a couple of your kitties and give it to Leo to smell.
Another idea, you could try letting him get used to them one at a time. Let one in the room with him or if that's not safe put one in a carrier and let him see it.