Polygonatum, commonly known as Solomon's Seal, has a long history of use in traditional Chinese medicine (TCM) and other Asian herbal systems. In TCM, the rhizome of Polygonatum species (especially Polygonatum sibiricum and Polygonatum odoratum) is used to nourish yin, moisten dryness, and tonify the lungs and kidneys. It is sometimes included in herbal formulas intended to address symptoms related to insomnia, such as restlessness, night sweats, or general weakness, based on the belief that strengthening yin and calming internal imbalances can help promote restful sleep.

Despite this traditional use, scientific validation for Polygonatum's efficacy in treating insomnia is limited. Most available studies focus on its antioxidant, anti-inflammatory, and immunomodulatory effects, rather than direct effects on sleep quality or insomnia. A few animal studies suggest potential sedative or anxiolytic effects, but these are preliminary and do not provide robust evidence for clinical effects in humans. Systematic reviews and clinical trials specifically focused on insomnia are lacking as of 2024. Therefore, while Polygonatum is traditionally used for symptoms that might co-occur with insomnia, its direct effectiveness for sleep disorders remains unproven from a scientific standpoint.

In summary, the use of Polygonatum for insomnia is primarily justified by traditional medicine practices, with modest historical evidence and very limited scientific support.