I lay on my back and keep still; only moving to stretch, roll, or swallow saliva if I feel discomfort. I am experimenting with how sleep paralysis happens to me. SP never happens but I got some hypnagogia and eventually a DILD later on when I noticed a gigantic hole in my bedroom wall that led to a part of the house that just didn't exist.
Had a short lucid dream of me walking out of my home and into my backyard. The entry into the dream felt so much like what people describe Astral Projection is so I used this lucid dream to investigate. My conclusion after just 1 trial (lol) is that no, you do not "leave your body". I walked passed my mother in the dream and even though she was in the kitchen during my nap, she had different clothes on. Most telling of all, when I got to the backyard, some key items were missing that should have been there. The dream ended as soon I tried to exit the backyard and summon a dream character. The method I used was SSILD after a WBTB. I still maintain that timing is more important than technique. However, a tip to remember with SSILD is that the goal is to be relaxed and aware; much like meditation. During each of the "cycles" as CosmicIron would put it, be aware of as much as you can. Even if you see/feel/hear nothing, just be aware of that fact. Nothing spectacular is supposed to happen during the technique so-to-speak.