Cinnamon spice is safe to eat as a spice or flavoring agent when you take it in normal doses. It's safe to drink as tea, though high doses and certain types can worsen some conditions. Taking large doses of cinnamon for long periods, or drinking a lot of cinnamon tea for a long time, can cause digestive upset.

Coumarin, an ingredient in some cinnamon products, can cause liver problems, but the amount you'd get is so small that it probably won't be a problem. Given the lack of evidence about its safety, children, pregnant women, and women who are breastfeeding should avoid cinnamon as a treatment.

The advantages of drinking cinnamon tea before bed include supporting a weight loss program and easing sore muscles. Additionally, it promotes digestion of the food consumed during the day, speeds up metabolism, and helps with weight loss. And it continues to function as you restfully sleep the next day.