I'm not an expert on this matter, but it seems that you primed yourself to think that to a subconscious level, maybe try to prime yourself to think about gratitude first thing in the morning, but you'll have to belive deep down that is true, useful and important otherwise those dreams will be more interesting to your mind.

Maybe you could start being grateful about the dreams and let them go, and focus on your body, be grateful you have two legs, you can breath... (find your own things).

Gratitude is not just contemplative bullshit, it can be about action, like OK I'm acknowledge all these good things I have, and I need to fight thermodynamics, taking action or they might go away, like are you grateful you have two legs, take the action of walking and so on, it can be about honoring those things we take for granted but we can lose.

I hope is not too cheesse or sounded crazy.