I'm taking the kids to Belgium at the end of August and have booked the overnight ferry from Harwich to the Hook of Holland and back. I've booked a cabin but I've never travelled overnight on a ferry and would like to know a bit about the logistics. How early can we board (I want to get them settled into bed well before the sailing time!)? What do I need to take on board? What happens when we arrive super-early; do they get everyone up and off straightaway? Any tips?