Your brain actually operates at a higher frequency when dreaming than the normal waking state (not sure how it compares to other elevated awake states). So if you are lucid enough I guess it would be like you're REALLY HIGH ON LIFE THE ENTIRE TIME.

Also, in a lucid dream you can do anything you can possibly conceive of, like shapeshift into a castle, taste all your favorite music, or even BE THE BEST MOVIE EVER.