Prolonged sleep

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Possible Answers: COMA.

Random information on the term “COMA”:

Coma is the nebulous envelope around the nucleus of a comet. It is formed when the comet passes close to the Sun on its highly elliptical orbit; as the comet warms, parts of it sublimate.[1] This gives a comet a “fuzzy” appearance when viewed in telescopes and distinguishes it from stars. The word coma comes from the Greek “kome”, in Greek written as κόμη, and can be translated as “hair”.[2]
Taken from Wikipedia