Thanks for the link. In the comments, a parent remarks that the daughter fell asleep to lullabies, but the son resisted them. He would fall asleep to loud, active music which apparently distracted him so much he forgot to fight sleep.

I watched my mother sing my nephew to sleep once. She sang 'Pony Boy,' not a song I would label a lullaby. She'd sing it, and he'd tug on her sleeve for her to sing it again. She would, but each time softer. When it was all but inaudible, he finally went to sleep.