I read how to get to the airport in Venice by 5:00 AM (land taxi), but where is the best place to 'sleep' the night before? Venice or the mainland?
We did this several years ago and we opted to stay at a hotel right by the airport on the mainland and it worked fine. The hotel ran a shuttle to the airport and several people like us were on it for the early flights. We just left our luggage at the train station on the last day, explored Venice until after dinner, picked our luggage and took a taxi to our hotel.