Early this morning, I woke up to pee, as I often do, and then went back to bed to catch a couple more hours of sleep. As sometimes happens when it's light out when I do this, I had a hard time falling back to sleep. So I thought about getting out of bed, getting dressed and curling up on the couch, maybe with a movie. Picturing being on the couch was enough to make me fall back asleep.

What is it about couches?