Crossword Genius

When cold, people often sleep in such a position (6)

Ross

I believe the answer is:

foetal

(Other definitions for foetal that I've seen before include "defensive position" , "regarding developing creature?" , "Relating to the baby in the womb" , "Relating to unborn child" , "Relating to an unborn in the later stages of development" .)

I've seen this clue in The Guardian.
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