welcome to dreamviews

for question one, yes sleep positions affect your lucid dreams, I believe laying on your back is the best.

as for how long it takes you to sleep, I suggest that you try something to help, it should only take you around 7 minutes to go to sleep. I sleep with a fan, that helps me, maybe you should look into things that help you get to sleep. I know that that was not your question, but I dont think there are anything for your sleep pattern, everyones is slightly different.