Agrimonia pilosa, commonly known as hairy agrimony, has a longstanding history of use in traditional East Asian medicine, particularly in Chinese and Korean herbal practices. Within these traditions, it has been included in various herbal formulations aimed at calming the mind and improving sleep, though it is more widely known for its application in treating gastrointestinal disorders, bleeding, and inflammation. The use of Agrimonia pilosa for insomnia is primarily based on such traditional practices rather than robust scientific validation.

There is very limited direct scientific research supporting the efficacy of Agrimonia pilosa as a treatment for insomnia. Some traditional texts and pharmacopeias mention its use in calming the spirit or as a mild sedative, but these claims have not been substantiated by clinical trials or pharmacological studies specific to sleep disorders. A few preclinical studies suggest that certain flavonoids and other compounds present in the plant may have central nervous system effects, but evidence remains preliminary and indirect.

In summary, the use of Agrimonia pilosa for insomnia is justified mainly by tradition, with minimal direct scientific support or clinical evidence to affirm its efficacy for this specific indication.