Jakob must be having weird sleeping postions to lay his head on that rock.
>getting tired
>in the middle of nowhere
>find a nice and comfortable place
>laydown
>find out that your head is in the wrong angle
>look for something to elevate your head, so thats on shoulder level
>find a rock that weights many hundreds of kilos
>the rock is square and half a meter high
>laying my head on this rock will be a lot more awkward than putting my head on the floor.
Whoever found that rock must be beyond reason. This is in no reasonable way a rock size suitable for a headrest