I'd have to add, I found it incredibly difficult to get to sleep on the train. I think if I were doing it again, I'd get the train from Paris to somewhere like Montpellier or Narbonne and stay overnight in a hotel, then get the train down to Barcelona. And in your case, on to Valencia. While in theory you save on the hotel going by night train, in practice you barely get any real rest and certainly not the kind you'd want before a cycling event.
I'd have to add, I found it incredibly difficult to get to sleep on the train. I think if I were doing it again, I'd get the train from Paris to somewhere like Montpellier or Narbonne and stay overnight in a hotel, then get the train down to Barcelona. And in your case, on to Valencia. While in theory you save on the hotel going by night train, in practice you barely get any real rest and certainly not the kind you'd want before a cycling event.