Dr. Petit: There's some of both. The daytime's easier to focus on positive things. Falling asleep and waking up are the hardest times. The transitions from sleep to wakefulness. It pretty much comes back every day.
Oprah: Do you fear going to sleep?
Dr. Petit: In the beginning, I feared sleeping. ... I was completely fried. I was just walking around in a daze, and just intrusive thoughts banging into your brain every second, every minute, where you're playing events over and over and over again in your mind.