What Sorts Of Dreams Do I Usually Remember?

Actually, I remember only one sort of dream or when I have had some other sort, I just have forgotten it as soon as I have waked up. Perhaps the reason why I remember precisely that sort is because I have dreamed it not only once. The sort I'm talking about includes 5 or 6 different dreams and a lot of water. Most of the time there is sea or ocean and sometimes just a small lake. All of them make me feel so relaxed.

I'll tell you about some of my dreams...

The first began with me staying on top of a rock, and then I suddenly jumped off it and flew down to the huge, blue sea. I couldn't see anything else but it. I felt the wind in my face while I was falling down. It was fantastic. A moment later I was swimming in the water. I noticed then that a few more people were swimming with me. I didn't know them, but I felt like I had known them all my life. I could breathe under the water, so I continued swimming. Around me it was full of all kinds of fish. I remember it so clearly as if I have just dreamed it.
The other dream was again in the sea or ocean. I can't remember. This time it was full of mermaids. They were so beautiful and graceful. With their color hairs and refined tails they were swimming with me and we were collecting something (I don't remember what) from the seabed. However, after a while, I emerged to the surface of the sea and realized that I was closed in a huge, round, black barrel! There was some kind of banister, and I tried to reach and climb it up, but there were also people who didn't let me do it and were pushing me back to the water. I tried to reach the parapet harder, and suddenly I was on it. I saw a door and began running towards it. Outside I was alone at first. There was only a beautiful field. The weather was warm, and the sun shone. Suddenly, a boy, whom I didn't know, came to me and said something. The next moment we were running. Then I usually woke up. It's very funny and strange, isn't it? But all dreams are amusing and freaky.
Many people say that dreams show you the future, but I don't believe it. I have read some things about the dreams, and the most researches, as I remember, show that the dream helps the brain to memorize what had happened through the day in some strange way or that the dream is like a mirror of the day i.e. some happenings, thoughts, fears, desires or imagination.