I keep having the same dream agian and I don't have a clue what it means?

I'll tell you about this dream. I'm on the beach with either my friends or my family it always changes and they are surfing. I'm just on the beach sitting there peacefully and all of a sudden I see a tidal wav comeing and I'm screaming to them get out of the water theres a tidal wave but none of them listen. Then I wake up. Please help me interupted this dream, I don't know what it means and I would really like to know. Please help!!!