Markham Heid wrote an article titled Why Your Brain Needs Idle Time: Some vital brain functions demand downtime.
Heid quotes Prof. Loren Frank of the UCSF Center for Integrative Neuroscience:
“To learn something well, you need to study it for a while and then take a break… The brain needs free time to process new information and turn it into something more permanent… just a few minutes — five to 15 — are enough to aid learning.”
“When rats are allowed to rest after completing an unfamiliar maze, their brains appear to automatically replay the experience of navigating the maze. Confronted later with the same labyrinth, the rats find their way through it more quickly.”
“When rats are immediately confronted with a new challenge after completing a maze, their brains don’t have the chance to replay what they’ve learned, Frank says. Later, when challenged again with the same maze, these rats aren’t able to navigate it any faster than they did the first time.”
“Experts say idle time likely also helps develop mental processes that are far more complicated than memory storage and retrieval. “The deeper reflective states, where you make meaning of what’s going on and connect it to self and identity and integrate knowledge together into coherent narratives — these kinds of processes only happen when you’re not focused on some in-the-moment activity,” says Mary Helen Immordino-Yang, a professor of education, psychology, and neuroscience at the University of Southern California.”
“Mental idle time, meanwhile, seems to facilitate creativity and problem-solving. “Our research has found that mind-wandering may foster a particular kind of productivity,” says Jonathan Schooler, a professor of psychological and brain sciences at the University of California, Santa Barbara who has studied mind-wandering extensively. He says overcoming impasses — including what he calls “a-ha!” moments — often happen when people’s minds are free to roam.”
“Schooler mentions the common experience of not being able to recall a word that’s on the tip of your tongue — no matter how hard you try to think of it. But as soon as you move onto another mental task, the word pops into your head. “I think it’s very possible that some unconscious processes are going on during mind-wandering, and the insights these processes produce then bubble up to the surface,” he says.”