Never book an adjoining room.
It’s finally the day of your cruise. You get aboard the ship and unpack and head to dinner. When you get back late at night and try to fall asleep, you find yourself unable to sleep. What happened?
You might’ve booked an adjoining room.
Cruise cabin walls are usually decently insulated against sound, but not so when you have a door between adjoining rooms. If you or your travel agent pick your room, double check that it’s not an adjoining cabin. When you look at the deck plans, there is usually an icon of some sort in the legend that indicates which rooms connect to each other.
Unless you’re traveling with a group and want to have rooms connected, I would definitely avoid booking an adjoining room. Even if you’re in a group, you can go to the hallway or ask your room steward to open the balcony divider.