The use of silk tree (Albizia julibrissin), also known as mimosa tree, for insomnia is primarily justified by traditional medicine, particularly within Chinese herbal practice. In Traditional Chinese Medicine (TCM), the flower and bark (collectively called He Huan Hua and He Huan Pi) are classified as calming agents that nourish the heart and calm the spirit. They are commonly prescribed to alleviate symptoms such as insomnia, anxiety, and emotional disturbance.

The historical use is well-documented in classical Chinese medical texts, where silk tree is described as having properties to "relieve constraint," "invigorate blood," and "ease the mind." While there are a handful of pre-clinical studies suggesting that extracts of Albizia julibrissin may have sedative, anxiolytic, or antidepressant-like effects in animal models, robust clinical trials in humans are lacking. The available scientific evidence is preliminary, often limited to in vitro or animal studies, and does not yet provide high-quality validation for its effectiveness in treating insomnia in people.

In summary, the use of silk tree for insomnia is rooted in a long tradition, particularly in East Asian medicine, but its efficacy is not strongly supported by scientific research at this time. Individuals interested in this treatment should consult healthcare professionals and consider the limited evidence base.