Sleeping and dreaming

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Across
  1. 2. you usually feel like this after a heavy meal
  2. 3. the past form of fall (asleep)
  3. 4. If you are sleeping deeply, you are ... asleep
  4. 6. a short sleep, e.g. after lunch
  5. 8. ...your alarm to 7 a.m.
  6. 9. sleeping... can help people fall asleep
  7. 12. a bad dream
  8. 13. an illness when people cannot fall asleep
  9. 15. sleep like a ... (when it's hard to wake you up)
  10. 16. when people make loud noises while sleeping
  11. 17. the past form of wake (up)
  12. 18. a thick blanket for winter
Down
  1. 1. you feel like this after flying to the USA
  2. 5. You should wash your ... every week, to keep your bed clean
  3. 7. coffee can keep you...
  4. 10. you put your head on it in the bed
  5. 11. if you are bored or sleepy, you ... (=open your mouth)
  6. 14. the past form of 'oversleep'