They supposedly got this via Google search statistics, but it sure seems weird to me with all the "teeth falling out" dreams. I notice this was done in the UK, and everybody makes fun of British teeth, and all the "teeth falling out" countries seem to have a historical connection to Britain.
Anyways, I don't believe I've ever had a "teeth falling out" dream. If I were to psychoanalyze myself, and I don't know if this might be common with gunowners, but I think my most frequent (I'm assuming from the graphic that they're looking at unpleasant dreams vs pleasant or neutral) dreams involve me needing to use a gun, but I can't. Usually either no matter how hard I press, I can't pull the trigger all the way back, or the gun just doesn't work. Probably my second most frequent is something bad happening to me in the water - either sucked underwater, or some ginormous wave engulfs me (and then I wake up). I'm assuming that whatever they mean, the scenario is connected to all the time I have spent on and under the water in my life.
Sorry the image is so ginormous - anything smaller is too hard to see.