" It’s therefore unsurprising that the dominant emotions in Dreamland are negative. When you are visiting Dreamland, you may sometimes feel happy, even elated, but mostly you feel dragged down by anger, fear, and sadness. While we sometimes dream of thrilling things, such as sex or flying like a bird, those happy dreams are much rarer than we think. People fly in only one out of every two hundred dreams, and erotic content of any kind occurs in only one in ten dreams. And even in dreams where sex is a major theme, it is rarely presented as a hedonistic throw down. Rather, like our other dreams, sex dreams are usually edged with anxiety, doubt, and regret. "

― Jonathan Gottschall , The Storytelling Animal: How Stories Make Us Human