Yes, we usually see reductions or effect sizes above 0.5. There is moderate to large effect size in improvements in daytime PTSD. That would be a reduction of at least 30% to 50% in daytime symptoms severity by treating sleep. If you sleep better, you're less reactive. You're in a better mood. You're less anxious. You're less fearful of different things. Now we don't treat PTSD; it's very rare. It's happened, but it's very rare that only focusing on sleep is enough to treat PTSD, but it does give us a leg-up in the treatment of post-traumatic stress, which is emotionally demanding and often scary for people.
On November 26th, 2013. See this statement in context.