Here is a simple way to mark the transition from morning work to afternoon work. Keep a scent in your desk drawer. After lunch dab the tiniest bit under your nose. This scent reminds your brain that you have afternoon work to complete. No afternoon drowsies allowed.
My favorites are Tocca Florence and Bulgari’s Omnia Coral.
If you are a teacher, try standing at the classroom door after lunch with a few scented chapsticks. Give each student the opportunity to put a dot of chapstick on the back of her hand or on her wrist. The older students may think it’s funny at first, but once they see the benefit of a peppermint whiff during the PowerPoint in the dark room, they will thank you!