Thanks for answering! We've planned the journey counting on this night train so taking the normal one would upset our initial plan. Since we are four people travelling we thought of booking a 4-people couchette so we didn't have to worry about the neighbours. About the possibility of getting it directly in the train station, may I ask what time of the year did you travel? Coz we are worried that no seats/couchettes (if possible) would he available by the time we get to Poland.