Last week, my dad was surprised when Jesse told Diego that he hadn't been sleeping and to head back upstairs. He was amazed because Diego's room had been completely silent for an hour and so he was pretty sure he must have been sleeping. Yet, here Jesse was sending him back to his room. How could Jesse tell? It's pretty simple, really. If you know what to look for. The next time Diego came down the stairs, my dad understood exactly what had been missing before.