I just read this interesting article about dreams in Psychology Today. Basically, as the theory goes, we dream to rehearse, mostly to prepare for the wost. Evolutionarily, this provides an adaptive advantage, explaining why, as the researcher stipulates, most of our dreams are survival scenarios meant originally to prepare us for life or death situations for which there is often no second chance. This researcher points out that most dreams are nightmares, though we do rehearse fantasies and solutions too. After recently listening to Radio Lab’s episode on dreams, this article confirms the utility of “sleeping on it” for songwriters and guitar players who write songs and practice guitar pieces in their sleep, waking to find the song or the riff flows easily the next morning.