Some friends of ours went on a Caribbean cruise booked an inside cabin. They over slept the first night because of 'no light'...didn't know it was morning, didn't set their alarm. After the first night they slept with their room door opened. Couldn't take it the complete dark! Now they will take anything, anywhere on the ship except an inside cabin.
Even the thought of an inside cabin gives me the 'creeps'....couldn't take it. NEED air, NEED windows!