text: Chapter 3
  Spiritual Readiness
  Spiritual readiness includes the development of the personal qualities needed to
  sustain a person in times of stress, hardship, and tragedy. These qualities come from
  religious, philosophical, or human values and form the basis for character, disposition,
  decision making, and integrity.
  SLEEP READINESS
  3-23. To achieve optimal readiness, Soldiers must have sleep and the more sleep obtained the better.
  Inadequate sleep weakens Soldier performance and jeopardizes the mission. Sleep readiness consists of three
  components:
  * Duration because the health and functioning of the brain depend on the amount of sleep obtained.
  * Timing because the ability to initiate and maintain sleep (and thus maximize the amount of sleep
  obtained) is strongly influenced by the brain’s internal clock.
  * Continuity because the extent to which sleep is undisturbed by arousals and awakenings influences
  both the duration and the depth of sleep. Deeper sleep is more restorative.
  3-24. The goal of sleep readiness ensures that the Soldier’s brain and body have adequately recovered so that
  he or she can tolerate repeated exposure to physical and mental stress. Like the rest of the body (muscles,
  skin, and internal organs), the brain has physiological needs for food, water, and oxygen—basic needs that
  must be met not only to ensure proper brain functioning, but also to sustain life itself. However, unlike the
  rest of the body, the brain has one additional physiological need: sleep. The brain requires sleep to maintain
  normal function. Sleep is necessary to sustain not only alertness, but also higher order cognitive abilities such
  as judgment, decision making, and situational awareness. In short, sleep makes Soldiers better at being
  Soldiers.
  Sleep Readiness
  Sleep is the critical requirement for brain health and function. Sleep readiness is the
  ability to recognize and implement the requisite sleep principles and behaviors to
  support optimal brain function. In turn, sleep readiness underpins a Soldier’s ability to
  meet the physical and nonphysical demands of any duty or combat position,
  accomplish the mission, and continue to fight and win.
  Domains
  The five domains of the holistic health and fitness (H2F) program build the Army’s
  readiness goals and are based on the principles of optimization, individualization, and
  immersion. The goal is to improve each Soldier’s physical lethality and mental
  toughness through the linking of physical readiness, nutritional readiness, mental
  readiness, spiritual readiness, and sleep readiness.