when they were allowed to rest after completing an unfamiliar maze, their brains appear to automatically replay the experience of navigating the maze - they were able to solve it again quicker
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
important for learning well - cramming in knowledge all the time without a break is generally not useful (after all understand requires effort, and effort requires rest)