Sleep introduction 1/f fluctuation - Natural sounds for sleep -

Sounds of nature such as the sound of the rain and the sound of the river are recorded as a set.
The sound of nature adjusts the autonomic nervous system and is a sound that contains 1 / f fluctuation that is a relaxing frequency, so it is ideal for creating a relaxed space.
 When you want to calm your mind and get a good night's sleep. It is a calm time what you need for a regular stressful society. Listen to the sound of healing and charge your source of energy.