I remember back in the days when I was young, i used to dream about me diving/swimming underwater. I also remember how I questioned my reality and thought it was strange that I could breathe underwater. But as I had no clue about lucid dreaming whatsoever I never became lucid:(. So far I’ve had ONE single lucid dream that did last for like 15 sec, I was dreaming that i jumped into a lake and directly questioned my reality when I noticed I could breathe → lucidity.
To the question itself, how do I make it more likely to dream about these spesific dreamscenes?
Appriciate your answers and thoughts bout it,
/Mattias
Start by visualizing, or just thinking about the dreamscape/theme during the day. Make sure you’re thinking about it a lot throughout the day. But don’t let it interrupt your daily life too much. Eventually it should tap into your dreams.
You could also try to visualize and think about your Dreamscape/theme while you’re in bed. You might just form it through HI.
Good luck! 
Alright, yeah iv’e been tryin to visualize other dreamscapes when Im about to sleep, but it just keeps me awake, and i’ve actually never been able to get any signs of SP no matter how tired/relaxed I am… lying completely still for like 40 minutes til i eventually give up. But I’ll try to think bout it thruout the day, thanks!