I think your playing too much COD5 or Left4Dead ..
But people have had good suggestions for you. Try not to watch TV before bed and just read a nice book. It should take your mind away from everything, should be relaxing. Avoid spicy food too..
As for me I don't dream too often, none I can remember anyways. But I've always remembered this one because it was so weird. There was a party in my house, although just in one room. Its a bedroom and not very big in real life but in the dream it was huge and there was tons of people. I couldn't hear sound or people talking and then all of a sudden the phone rang and I answered it. All that came out of the phone was loud screaming and then I woke up.
I have dreams too where it feels like I'm being held down or something, which is really weird. Also that thing when you feel like your falling is pretty cool, I haven't had that in awhile.