Your brain can not tell the difference between what you imagine and what is actually happening. Use it to your happiness advantage!
Remember a time you felt happy:
Recall what you looked like, the sights, sounds, scents, colors and how you felt. If a time doesn’t come to mind pretend you are someone else and daydream. Your brain can’t tell the difference!
Find an object, picture or trinket that represents or symbolizes that time. If you don’t already have a souvenir keep your eyes open for something that helps you recall that time & place.
Carry your object in your pocket, put it on your desk, hang it on the wall.