A New Theory Linking Sleep and Creativity

A new theory that explains why sleep and creativity are linked. Specifically, their idea explains how the two main phases of sleep—REM and non-REM—work together to help us find unrecognized links between what we already know, and discover out-of-the-box solutions to vexing problems.

As you start to fall asleep, you enter non-REM sleep. That includes a light phase that takes up most of the night, and a period of much heavier slumber called slow-wave sleep, or SWS, when millions of neurons fire simultaneously and strongly, like a cellular Greek chorus.

 

The other phase of sleep—REM, which stands for rapid eye movement—is very different. That Greek chorus of neurons that sang so synchronously during non-REM sleep descends into a cacophonous din, as various parts of the neocortex become activated, seemingly at random. Meanwhile, a chemical called acetylcholine—the same one that Loewi identified in his sleep-inspired work—floods the brain, disrupting the connection between the hippocampus and the neocortex, and placing both in an especially flexible state, where connections between neurons can be more easily formed, strengthened, or weakened.