How many travel days do I need for a night train?
When traveling on a night train, you only need to use a single travel day: your day of departure. Even though most night trains leave on one calendar day and arrive on the next, you're never required to use two travel days.
When traveling by overnight ferry, you can choose whether you fill in the departure date or the arrival date in the travel calendar. You don't need to use any travel days for discounted ferry trips, just show your pass to get the discount.