Everyone likes the sound of a river
　 　 　
Try listening closely to the gentle flowing sounds of a stream. You will soon get sleepy. It’s said that the murmuring sounds of a river relaxes a tired person’s mind. How does this happen? Listening to hushed sounds like a flowing river creates alpha waves. Alpha waves are brain waves that make people feel comfortable and at ease. Sounds travel from the ears to the brain and create waves in the brain. People also feel relaxed when they hear the chirping of small birds or the sound of gentle ocean waves. That’s because these sounds also create alpha waves, just like the sounds of a stream do. All of these sounds come from nature. That’s why if you go into the hills, a forest, or other natural place when you are tired and listen to lots of natural sounds, you will feel refreshed.