Coincidence or sign?

Today was kind of a weird day for me. Let me tell you what happened. I was waiting outside the Physics lab today for the teacher to come. All of a sudden, my friend told me she had a dream last night. I didn't really pay attention to her until she told me it was about me. Me? In your dream? I was so curious. Finally, she told me her dream. She said she didn't really remember the dream in detail. But, she said she saw me crying and quarrelling with someone (she knows and I know). And there it goes. Me and that someone quarrelling? That's impossible!!! It's like really "tak mungkin" and "TAK MUNGKIN"! So, I didn't really bother about it. Another one came after school was dismissed. My assistant class rep told me that she dreamt of me last night. I was like.. HUH!? Another one? So, I asked her what was it. She said she saw me crying. Questions really rushed into my mind. Crying? AGAIN? I know I cry a lot. But, it's not that it's without a reason. I was buying my lunch in the canteen at that time when I bumped into Janice. She was rather excited when she saw me. She said,"Kar Men, I dreamt of you last night." THE THIRD ONE!!!??? In a DAY!!!??? How can it be? She told me she saw me in a place (not suitable to share here cause some people will think too much). Don't simply guess. You can ask me personally. I MIGHT tell you if I'm in the mood to. Haha.. But, it was really weird you know. Three people telling you that you were in their dreams...? And mind you, it's all connected if you put them together. Though it kind of scared me off, I don't really care about it already because I know I have done enough and I have done my part. I guess, some people will know what I'm talking about. =)

Just curiosity... Why do people dream? Does it mean anything? In this case, I would really want to know whether it's a coincidence or a sign. Hmm...