https://www.eastbaytimes.com/2025/05/08/larry-magid-earbuds-to-help-you-sleep/

An article on the Harvard Medical School website said that “pink noise can enhance deep sleep in older adults and improve cognitive performance.”  Brown noise can also help sleep, but the article cited research that “white noise had little beneficial effect on sleep.” I had never heard of brown and pink noise, but Dr. Anil Rama, who runs the Sleep and Brain clinic in Saratoga, told me that “Pink noise is like steady rain while brown noise is like ocean waves. Both can quiet a restless mind and ease you into sleep.”

The Harvard Medical School article quoted Dr. Sogol Javaheri saying, “More data is needed to determine what role pink and brown noise may play in sleep, such as what volume and duration would be of most benefit,” Javaheri said. “For now, I would not recommend pink or brown noise continuously, but rather use it for a set time if it helps you fall asleep more quickly.”