You may think the best way to solve a tough problem is to keep working on it, even overnight. But the truth is just the opposite: Your best chance to get to the bottom of a problem is actually to sleep on it.
A team of researchers at Northwestern University, US, found that sleeping is useful in both strengthening and re-organizing memory. This can help you solve problems.
The researchers did an experiment with 57 students. They asked them to solve 42 difficult puzzles on the first day. The students worked on each puzzle while listening to different music. The research encouraged students to remember the music they heard while solving the puzzles. By the end, there were six puzzles that the students still hadn't solved.
The students then went back home to sleep. They were given special sleep-monitoring (睡眠监测) and music devices (设备). The devices played music linked with the unsolved puzzles while the students were in the slow-wave sleep stage. This stage is when people are likely to dream and re-organize their memories.
The next morning, the students tried the unsolved puzzles again. Researchers found they were 55 percent more likely to solve them. The music activated (激活) the memories they had of the puzzles while they were sleeping. It allowed them to "work" on the puzzles in their sleep.
Earlier studies of both people and animals have shown that sleep cannot only strengthen memory, but also help us organize information in our brains. This study seems to support that understanding. So the next time you face a difficult problem, sleep on it. Then play some music to remind yourself of the problem.
