Many symptoms of menopause may contribute to poor sleep and insomnia. These symptoms may also be associated with anxiety and affect the quality of women’s lives. The purpose of this study was to assess the effectiveness of a polarity therapy on insomnia and anxiety for women aged 40 to 60 years old. Forty-seven women participated in this experimental study. The participants were randomly assigned to the experiment group (n = 25)—receiving 4 sessions on polarity—or to the control group (n = 22)—receiving information on healthy sleep habits. Data were collected during the pre-test and the post-test using the Morin Insomnia Severity Index and the Spielberger State-Trait Anxiety Inventory (FormY). A significant difference was found between the groups and the measurement time with respect to insomnia scores (F = 28.66; p < 0.0001) and anxiety scores (F = 14.14; p < 0.0001). Women who received the polarity intervention showed a significant decrease in the severity of their insomnia and of their state of anxiety compared to those in the control group during post intervention. The polarity intervention was effective in reducing the women’s symptoms of insomnia and anxiety in the middle-aged women.