Ayer...

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Across
  1. 3. hallway
  2. 5. inside
  3. 9. I knocked
  4. 10. I opened
  5. 13. stairs
  6. 15. I found/discovered
  7. 16. the end
  8. 17. they fell down
  9. 18. I saw
  10. 19. door
  11. 23. slowly
  12. 24. I went/was
  13. 26. at the end (of the hallway)
  14. 27. I woke up
Down
  1. 1. car
  2. 2. dream
  3. 4. long
  4. 6. big
  5. 7. I went upstairs
  6. 8. mountains
  7. 10. yesterday
  8. 11. so, then, next, afterwards
  9. 12. upstairs
  10. 13. I entered
  11. 14. box
  12. 20. I arrived
  13. 21. all of the sudden
  14. 22. there was/were
  15. 25. when