I looked it up for tomorrow. 11:15 Amsterdam - 14:35 Paris Nord. Then 16:07 Paris Gare de Lyon - 22:44 Barcelona Sants. From Nord to Gare de Lyon you can walk,

I looked it up for tomorrow. 11:15 Amsterdam - 14:35 Paris Nord. Then 16:07 Paris Gare de Lyon - 22:44 Barcelona Sants. From Nord to Gare de Lyon you can walk, take a train or bus, depending on the weather. Have some late lunch or early dinner at a cafe and enjoy Paris for a bit. The total journey will take you 11 hours and 29 minutes. I'm not sure about the night trains and if they are still an option. Perhaps there are some improvements possible there, yes.