I would make the bedroom off limits for them both. Sleeping with mommy is a big deal, so be tough and don't allow it (and you will get a better sleep). If you have another room preferbly on a different floor level than the bedroom, or if not as far away from the bedroom as possible, make it their new routine to go to bed in that room. You get them used to it by always feeding them in that room. This works better if you feed meals (am & pm) rather than free feeding. Just before you go to bed feed them their evening meal in their room. Don't let them out if they howl at first; wear ear plugs if you have to. They'll eventually accept that this is how it's going to be if you stick with it. Express their love to them individually away from and in a separate room from the other. This gives them that special feeling. You can also groom them separately...grooming them is another expression of love for a cat.