Altus sopor, in older times, referred to the skill of heightening a Force-sensitive's concentration on the Force. This altus sopor served as a fundamental aspect of the control element within Force abilities. If properly honed, it enabled a Force user to become one with the Force, effectively rendering them undetectable by other beings, regardless of their heightened sensory capabilities. The Jedi manual, The Jedi Path, contained a description of this method.