hummm,,,,,get a cabin!!!,,,if its a night crossing your chances are slim to none this time of year,,unless you have pre booked from last year,,,,best effort is to smooth talk the toll clerk and ask for a premium crossing, that may get you a cabin cuz you load first and off first,,,,,trying to sleep in one of Marine Atlantics' chairs is a task to be avoided at all costs by any adult,,been there done that!!,,,,,,lots of cabins on the day crossings,,,,plus if you are departing from the North Sydney terminal you drove right by my door and never waved!!!,,,,, :o)