The brain benefits of deep sleep

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Across
  1. 4. a gadget or device
  2. 5. a sleep disorder characterized by pauses in breathing or periods of shallow breathing during sleep
  3. 6. danger or risk
  4. 8. A daily rhythmic activity cycle, based on 24-hour intervals, that is exhibited by many organisms
  5. 9. to attract and hold the attention or interest
Down
  1. 1. the condition of being robbed of sleep, in real life or in experiment, as opposed to being unable to sleep
  2. 2. a medal or token signifying an awarded honor or distinction; also in figurative use
  3. 3. acting or tending to act too hastily or without due consideration
  4. 7. to restrain, hinder