As unusual as this may seem, it is perfectly scientifically accepted that lucid dreaming is real. Whether or not you have a spell that makes it more likely; most people have occasional lucid dreams when they are not trying to.
Keep in mind that lucid dreaming is when you know that you are dreaming.
There are scientific ways to increase the likelihood of having one, but I can't say for sure about the spell.
Check out the Lucidity Institute here
And their FAQ here
for more information. Keep in mind that while their facts are realistic, they are a company, technically.