Rosemary essential oil is often used for alertness and stimulating memory. Dap a little into a handkerchief or cotton ball and inhale as needed. It can also keep you alert during long car trips or a long day at work. You Might Also Like Product discounts December 3, 2013 Lemongrass essential oil can be used to reduce pain March 9, 2015 Essential oils to help calm anxiety September 10, 2013