Marvel's Agents Of S.H.I.E.L.D. S02 E08 - The Things We Bury
Now that we know that the mysterious symbols in Coulson's head were a city layout, we finally understand why he was having such a hard time.
He had the equivalent of Dora The Explorer's singing map in his head.
Can you imagine trying to sleep with all the racket going on ?
"I'm the map, I'm the map, I'm the map, I'm the map, I'm the map !"...
...over and over constantly.