15. Stimulate your brain
Dab an essential oil of jasmine, peppermint, or vanilla on your arm and sniff. Scent researcher Alan Hirsch of the Chicago-based Smell and Taste Treatment Research Foundation says jasmine increases the beta waves in the frontal lobes of your brain, promoting wakefulness and enabling you to focus better and see things more acutely. All three scents stimulate the limbic system in your brain, which in turn stimulates the rods in your eyes that help you to see in dim light.