@shuahonqq well, it looks like you wanted to run away from the monster, but you couldn't because you were sort of "stuck" in bed. If I think of all the times I did dream research, it looks like there's something in your real life that you are trying to "run away" from. Maybe this is a relationship, a test, some personal problem. Usually when you are trying to avoid or run away from something in your waking life, you dream things like being chased by something or being unable to escape, like in your case you were unable to escape the monster. I'm sure if you think about your waking life a bit, you'll find something to link to the dream :)