Muerte - have you tried sleeping in total dark? I have a very hard time going to sleep, if anything, and like you, I wake up at sudden sounds. Sleeping in total dark helps a lot. That means closing all the blinds, making sure televisions have cooled down so they're pitch black... etc. Just a thought.
Good efforts so far AWB. The experience of the body shaking and extreme peace is not the intended result here but none the less a very good discovery en route. Lets just call it an accidental discovery whilst looking for something else. You can use this discovery to help you hunt the main prize which is still waiting.For any others trying this challenge replicating AWB's result is not necessary to achieve the main goal. It can help but dont focus on this.Achieving the goal of falling asleep inside your dream in the same position of your physical body leads to a very specific experience. Its a bit like finding gold treasure, but in a very real spiritual format. Happy hunting.