Too be honest, that was my first thought. It started a few weeks ago. One would climb on top of the other for a few hours or so...then they would separate again. But now they've been like this for days...I'm pretty sure three days...with no break. They must be exhausted! :)
I don't see any signs of death from the bottom one. From what I can see of it, it looks fine. Mind you, I'm not getting too close..;)...I'm assuming they'd like some privacy. lol