I've had a few vivid lucid dreams today, I guess there were four of them but only two of them were longer ones. I'd like to describe the second one (very vivid):

I woke up (false awakening) and went to kitchen where I realized I was dreaming (i didn't do reality check, I just realized it). So I wanted to test some abilities: First, I walked through a wall (for the first time in a vivid dream) outside and then I wanted to fly so I flied away. It was really great because I could feel the wind and could clearly see the ground under myself. I decided to land so I ended up in a forest where I tried another abilities: 1. there was a person which I decided to disappear, 2. I wanted to hear my voice and I did hear it, 3. I tried to say my name in a dream (which everytime I did somehow failed) and I DID say it out loud ! 4. I decided to change the scene (I said 'Change the scene' out loud). I ended up in a forest on another planet (there was interesting ambient) and then for some reason I saw fast food where I bought something to eat and it tasted like real food. Then it continued for a while on another place and then I woke up.

As for the questions:

1. Lately it's almost everytime that I begin vivid lucid dream in the place where I sleep. Is this normal? Can I change it somehow?

2. I've already had some experience with stabilizing lucidity by looking at my hands. I tried to do something I've found rather interesting: I tried to look at my hands and blinked. Everything went dark except for the hands - they were in a perfect state. Is it that brain counts hands as different from the surround? (after the blackness I could continue in another vivid LD)

3. Does the length of a vivid dream depend on ability of human not to blink - because when you blink in vivid dream, you lose clarity.