I was so excited, that the first time I woke up... but then I tried WBTB method.. and it worked great. Here is my account of the dream.

I am on a beach, and I somehow remember that I was just asleep, so I think, "How can this be possible?!". I instantly perform a reality check. I look at my hands. Sure enough, I have 6 fingers on one and 4 on the other. I am now lucid. Everything is extremely vivid and realistic. I can feel the sun and the warm wind, its a very blissful setting. The sand is very soft and deep. In an attempt to change the setting, I begin crawling away from the water, for some reason I cannot stand up, and the crawling is very slow, as my arms are fully enveloped in the sand with every movement. I can feel my mind starting to wander, so in fear of losing my lucidity, I use the common "rub your hands together" technique, which supposedly reconnects one's body with the dreamworld. It worked phenomenally, my lucidity reinstated instantly. However, when I reach the back of the beach, I fall into a sandbar like area, and I feel an intense sting on my arm. I realize I am in a pool fool of jellyfish. I try to remain calm, telling myself I am only dreaming. However it is so vivid and realistic that my mind quickly forgets that, and I become so frightened that I wake up.