I used to think this was just an expression, but apparently, not.
Griffin was asleep in this position. We'd gone to the park twice that day, once to exercise with my mom and the other time to play with Hyrum and Maddy. He got home and asked for his binki, but he didn't want to go to bed; he was watching TV when he fell asleep in this position. He was so out that he barely moved at all when I laid him in bed. Poor little guy!