There has been scientific research conducted into the calming effect of water sounds. One study published in the Journal of Environmental Psychology found that exposure to natural water sounds, such as waves or a babbling brook, can reduce stress and positively impact mood. The study also found that these effects were even greater when the water sounds were paired with visual stimuli, such as images of ocean waves or streams. 
 Another study published in the International Journal of Environmental Research and Public Health found that listening to nature sounds, including water sounds, can improve both subjective and objective measures of sleep quality. This suggests that water sounds could be used as a non-pharmacological intervention for individuals struggling with sleep disturbances or insomnia. 
 Overall, these studies suggest that there is a scientific basis for the calming effect of water sounds, and that they may have therapeutic benefits for individuals dealing with stress, anxiety, or sleep difficulties.