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All answers having "Sleeping" as clue:

3 Character Answers:

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CAR

OUT



4 Character Answers:

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ABED



5 Character Answers:

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INBED

NOTUP



6 Character Answers:

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AREYOU

ATREST

POTION



7 Character Answers:

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DORMANT

RETIRED



8 Character Answers:

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ASLUMBER



13 Character Answers:

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INHIBERNATION