[Time to impart some wisdom.] My friend taught me this one. First, you have to know you're dreaming. We can do whatever we want in them, but not always on purpose. So get in the habit of asking yourself if you're dreaming. This is a good trick. Say "if I'm dreaming, I could make beer or food here now". If it doesn't show up, you're awake. Try it again later, and if it works, you know you're dreaming. Then you can do anything you please.