What are the pros and cons of siblings sharing the same bed?

Well, when they are young, sharing a bed can be comforting and fun especially close to bedtime. If they have nightmares at night, having a sibling nearby will be less of a traumatic experience. But as they grow older, it will less and less fun and the lack of personal space will be a problem. If one is sick, you have to make separate sleeping arrangements. Also, after a certain age, I don't think siblings will want to share a room anymore, let alone a bed. If you do want to get just one bed, may I suggest a bunk bed. At least they have their own sleeping space and still be close to one another.