I discovered something interesting while watching the season finale of Hell on Wheels last night (yes, I'm a week or two late on that), Nathan loves the song "Devil's Waitin'" by Black Rebel Motorcycle Club.
(If the embed above doesn't work, listen on YouTube)
I bought the track from iTunes because I dug it and since it seems Nathan does too. I retested the theory about 15 minutes ago and... IT WORKED!
He had been a fussin' and a feudin' until I played the song off my iPhone and he was out like a light.
It's a beautiful thing.