Free __ Sleep Is Not Matched to a 24 Hour Cycle
This page is the CodyCross answer for the clue below from Prehistory, Group 1257, Puzzle 4 (Convergent Evolution).
Question is: Free __ Sleep Is Not Matched to a 24 Hour Cycle
and the answer is: RUNNING
Word Meaning:
RUNNING — present participle and gerund of run
Definitions from Wiktionary.