[Video Review] NOVA: What are dreams?

Figure 1. NOVA: What Are Dreams?

I watched the Nova "What are dreams?" It was pretty good, but too abbreviated for my taste. Interesting point that I didn't know was that there are 2 kinds of dreams:REM dreams and non-rem dreams. The non-rem are associated with positive feeling and the REM with negative. Also, people can perfom a task, sleep & dream, and wake up to do it better.