Ok I tried this for my first time today during an afternoon nap. I focused on my back sinking into my bed, and within minutes I felt like I was spinning out of control . After about a minute the sensations just stopped and I felt like I was just lying still in my bed again. I tried to get the sensations back, but failed. It seemed so easy the first time. This might be a dumb question, but could you maybe explain a little bit more on how you visualize yourself sinking into your bed?