While it's always best to request the bed configuration you want before your cruise, just because you enter your cruise cabin to find two beds when you're traveling with your spouse, or one bed when you're traveling with a friend, doesn't mean you're in trouble. Beds on most ships can easily be pushed together or separated; just ask your cabin steward to do it while you're out of the cabin. (If you're a light sleeper and worried about the cruise ship mattresses, you can always bring your own travel mattress overlay set).
