I noticed exactly the same thing. I've become increasingly alarmed at the decline of the lay/lie distinction in English, even in educated speech. In this case, though, I consoled myself that at least it created a rhyme. Contrast this to the chorus of "Truly Madly Deeply" by Australian pop-rock group Savage Garden:

  I want to stand with you on a mountain.
  I want to bathe with you in the sea.
  I want to lay like this forever,
  Until the sky falls down on me...

They missed an opportunity. Here the grammatically correct lie gives a lovely rhyme between the middles of lines 3 and 4:

  I want to stand with you on a mountain.
  I want to bathe with you in the sea.
  I want to lie like this forever,
  Until the sky falls down on me...