Hello Brothergoose and welcome to intro class!

General question - Does body position (back vs. side) affect dreaming/lucid dreaming?
Quite an interesting question. I think there may be some effect of different body positions on dreams and lucid dreaming, but usually this effect is not very pronounced. So, in general you don't have to worry that you have to sleep in a position that is not comfortable for you. If you are interested, however, you can note your sleeping position and see if it makes any difference for you in terms of ease of falling asleep, focus, recall, dream contents, lucidity, etc.