The science of sleep

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Across
  1. 3. Relating to the way in which a living organism's parts function.
  2. 7. A thick woven fabric, often with pictures or designs, used for wall hangings or soft furnishings.
  3. 9. A magical or medicinal potion.
  4. 11. Concerned with the act or process of knowing and perception.
  5. 13. Related to nerves or the nervous system.
  6. 14. An almond-shaped part of the brain involved in the processing of emotions.
  7. 15. A hormone that regulates sleep-wake cycles.
Down
  1. 1. Changes or variations in circumstances or fortune, often unwelcome or unpleasant.
  2. 2. Absolutely necessary or essential.
  3. 4. Pertaining to the brain; intellectual.
  4. 5. Done or active during the night.
  5. 6. Relating to the roughly 24-hour cycle in the physiological processes of living beings.
  6. 8. To renovate or redecorate.
  7. 10. Relating to the pineal gland, a small endocrine gland in the vertebrate brain.
  8. 12. Rapid Eye Movement; a phase of sleep marked by vivid dreams and active brain activity.