Lying River down actually became a game for him, and he would giggle and roll when we tried. I'm one of the ones HOPING that this is a phase...albeit a long one, he rarely stays lying when he goes to bed, I can hear him rattling the bars (I swear that cot is not going to survive for #2), banging the wall, singing...and then eventually silence.

So...we leave him, but only cos it's pretty useless to do anything else!