About 5 months ago i adopted 2 stray cats. Since then we have discovered that my boyfriend is allergic to dustmites which are on the cats' fur. Up until now they have always slept on the sofa and now I want to try and get them to sleep in a cat bed. I have tried putting them in it at night but they just jump straight out and in the morning I always find them on the sofa. Is it possible to break this habit?