Some people are more incline to remember their dreams then others, I think it's got to do with both sleeping patterns and other habits as well as a connection to your thoughts and emotions, if you don't it's no reason to be worried, however if you want to remember them, for whatever reason, there are some things that can help.
1) don't go to sleep with the TV or music on, or fall asleep while reading a book. Take your time to relax in bed and let thoughts and feeling from the day come and go till you fall asleep. Before you fall asleep try to have intention to remember the dream, you don't have to maditate on it or anything, just say to yourself "Tonight I'm going to remember my dream".
2) Don't stay in bed a long time after waking up, set an alarm clock and get out of bed as soon as you wake up.
3) start a dream diary - write whatever you remember from a dream in it, if you remember nothing, write "I don't remember" but do write something in there everyday. Even if it's just one item or one small fragment from a dream.
4) Try to have enough hours to sleep - about 8 per night.
read more about it:
http://www.lucidity.com/NL11.DreamRecall.html
http://www.dreams.ca/recall.htm
http://www.wikihow.com/Remember-Dreams