Personally I find it sad when people shut the bedroom door on their pets at night. Usually we are away all day at work and they miss us, and then they are faced with a closed door at night. This is why they cry - often they just want to be able to see us, check on us, not even necessarily sleep on the bed (or in the bed) with us. I sleep with my door open and my cats have always come for a little while but usually have their own place they prefer in another room. It just gives them peace of mind to be able to see "their people" and relaxes them so that they will sleep better during the night.