OK, this may sound wierd, and maybe DCL messed up, but our cruise will be me, DH DD4 and DS8. We are in a standard cabin with a bed and couch (I think). My thought was to take an inflatible twin air mattress for one of the kids. Mainly because they both sleep like octupi and would probably kill each other if they were together. I was planning to either stand the thing up in a closet or slide it under the bed during the day. Any thoughts, or am I as insane as my husband thinks??