A veteran who served in a combat zone is admitted to the inpatient psychiatric unit for severe anxiety and disrupted sleep. The nurse conducts a mental health assessment. Which client statement most strongly supports a diagnosis of posttraumatic stress disorder (PTSD)?

"I get anxious sometimes when I'm in crowded places like shopping centers."

"I try not to talk about the war much-it's in the past, and I've moved on."

"I think about the war more than I'd like, especially when I see the news."

"I wake up in a sweat almost every night because I'm back on the battlefield in my dreams."