Yeah, in PBP wheels to latch on to are like busses in Oxford Street, there is always another one coming along in a minute. Maybe not through the night.
My recollection is that, at times, I just wouldn't have the legs to jump on them. But I'd keep riding, stuff my face with food, and the legs would come back and then I could.
That section after Villanes is sweet. It's downhill, but not that much that it's obvious, and there are a few little lumps, but it makes you feel like that you are going well, even if you are not! I remember last time I felt I was going really well there, could get to Paris before dark, but everybody kept passing me!