How did you train yourself? Ever get to the sleep where you are literally passed out? If I start out on my back, I dont get into the deep sleep. During the night, I might have my mind awaken and then turn onto the back but I dont get into that deep, dream state. Also, I alternate between hands to the side, hands across the chest and hands on top of the hips - never can seem to get totally comfortable. Even tried a down pillow for tummy sleeping and then changing to a tempur pedic contour pillow for back and still dont get that deep sleep (though neck feels better cradled in the tempur pedic while on the back).