This is good advice. The first step to lucid dreaming is to remember your dreams (improve your dream recall). When you awake immediately make a note of your dreams, every detail you can remember.I used to keep a diary of what dreams I had, lucid or not I'd keep track of any I could remember.
And then because I knew I was dreaming, I could get on with whatever I wanted to (and no, it didn't always involve Famke Janssen )
There probably is. You can usually recreate something that happens naturally.
I've done experiments in lucid dreams. I have examined them to see if they are in 3D, and they are. They are in full colour. I tested to see if you could fly by will, and you can, but it takes time to work. I tested to see if you fall, and hit the ground you die, and you don't. I pinched myself, and I felt the pinch. I went on a walk around my block to see what the differences were in real life the next day, and the differences were mainly in sounds, but the actual sights were very accurate. So dreams are very detailed, and accurate, but a lot of sounds are missing.
I suffer from sleep paralysis and lucid dreaming. You're better off without it.