dreams of being cracked

I read about a new theory on dreaming:

Dreams are a sort of nighttime theater in which our brains screen realistic scenarios. This virtual reality simulates emergency situations and provides an arena for safe training: "The primary function of negative dreams is rehearsal for similar real events, so that threat recognition and avoidance happens faster and more automatically in comparable real situations." Dreaming helps us recognize dangers more quickly and respond more efficiently. ... The difference between the typical and optimal response could save your life. But making such a reaction swift and automatic takes practice. It's the reason martial arts students drill their movements over and over. Frequent rehearsal prepares them for that one decisive moment, ensuring that their response in an actual life-or-death situation is the one they practiced. Dreams may do the same thing.

It even offers a method for a brain to for select what to dream about:

The dreaming brain scans emotional memories. When it detects a memory trace with a strong negative emotion, it constructs a nightmare around that theme. The more traumatic the event, the more intense the nightmare. The brain's system for detecting threats is sensitive and flexible: Anything the brain tags with a strong negative charge gets thrown into the threat bin and dredged up at night. ... Even a single exposure to a life-threatening situation can plunge a person into an inferno of post-traumatic nightmares, dreams in which the threatening event—the attack, the rape, the war—is repeated over and over in every possible variation.

I had a dream I had been socially engineered. That I had given a root password to someone I suddenly realized was not to be trusted. If this theory of dreaming is correct it's good that it's in time with modern fears, not just being chased by tigers.