He wants to wallow in the grief and indulge in the cold stone in his gut that just gets heavier and heavier the longer he lays down and can't sleep. Oh yeah, Augustus can't sleep. Did he mention that? He must've. Probably. Whatever. (AKA, the effects of King's Tide told by Gus's point-of-view, where he suffers through the traumatic experience all alone in the dark.)