if you have problems ap'ing the best technique to silence the mind or keep it on one thing is to give it a question it cannot answer which is called a koan. for example pretend a tree is hanging over a cliff with a rope and you are holding onto it with your teeth with your hands/legs tied behind your back and you try to find a way out which there isnt but you try to figure things out ie swing around then stand still and hope an answer comes then if mind gets chattery again keep doing it over and over again til the mind is completely quiet. Two times I managed I think conscious ap's from it one time i had a falling sensation then i slowly crawled out, second time I felt like my physical body could move a bit but was difficult but it wasnt my physical body i imagined the roll technique bruce says and i rolled out turned around saw myself on the bed so this is a wonderful technique give it a shot if all fails.