Me, thinking about kinky stuff...
You should be afraid of shark but of people like me. Rolling around on your stomach with a frenchman around could be more scary for some then with a shark around.
You shouldn't sleep alone anyway, it's boring and there's no one around when you wake up in the middle of the night.
Dreams are message from our subconscient. Try to find the meaning of your dream and you will know yourself better and it will go away. Write down the component of your dream on a piece of paper ex:
Going on a boat
Island
First one in the water
Being on your back
Shark
Knife
etc...
Beside each component you write what your thinking about when you think about thoose thing. For exemple, what is a shark for you, a danger, something preventing you from going where you want, from being peacefull. A knife is a weapon, it gives you strength, confidence. You could interpret that you need more confidence to go where you want.
Try to find book about dream interpretation by Freud but be carefull, the guys see sex everywhere...
