I've always had more LDs than not and I have noticed many differences between them.

- When you realize that you are dreaming, your brain seems to expand and feel like its more open. My theory is that your concious feels more control, thus putting the brain more at ease.

- You become much more calmer. You feel like nothing can go wrong, since, unless you let it, you can't get hurt.

- You have a lot of fun because you can create what you desire. You wake up better because you weren't fearing loss of control in your dream even if that dream went well.

- It's just like thinking, only what you think comes to life.

That is really the best way I can compare to a non-lucid dream. I don't have many non-lucid dreams, but I am glad I don't have them. I like being in control.