the strength of this command depends on how sure the body is that the mind are sleeping, this depends on how still you lie, if you lie very still the body is almost convinced that the mind is sleeping, and send out a very tiny signal which can easily be ignored by you and result in
sleep paralysis with your mind awake,
sleep paralysis feels almost like led on top of your body, and can easily be mistaken for someone pushing you against the bed.
VERY SCAERY AND UNCOMFTABLE.!!!