Will is very attached to his blanket. The key to his happiness is the silky border, which he calls his “piece.” We often hear him cry for it while struggling to go to sleep… saying, “where’s my piece?”. Over time he has removed increments of the border, which I’ve then cut off. There is about a foot of silky border left, literally hanging on by a thread to the blanket.
Update: last night he cried from his bed, “my piece is broken!” It had fallen off, and I promptly reattached it and then he went to sleep.