Insomnia is a sleep disorder that reduces the quality of life. Insomnia affects the HPA Axis by increasing cortisol levels. Cinnamomum burmannii is a plant that has antiinflammatory and antioxidant activity. This study aims to determine effect of nonpolar fraction of cinnamon on cortisol levels. This study was an in vivo experimental study using a post-test only design and a control group at th…