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Sleep (hours needed (Adults 7-9, Link Title), Younger adults 7-9, Infants…

- - - - stress
      - inconstant sleep patterns
      - hormone imbalances
      - depression
- - - - light sleep and brain waves slow down
    - - light sleep before you enter deep sleep and brain waves are marked by brief bursts of electrical activity.
    - - Rapid eye movement, dreams, breathing is fast and irregular, hear rate is fast
    - - period of deep sleep where heartbeat and breathing slow to the lowest levels