There is extensive evidence that melatonin may be able to help with that. Anxiety occurs when your body is put on the defense; it feels like you are currently in a situation which is either frightening or dangerous — and regardless of what you are going through, it may feel that way to you.

Our bodies produce melatonin naturally, but it can be taken as well. There are positives and negatives to this, of course, it depends on how precisely your anxiety manifests itself.