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biological

Judged: two independent readers; copy check clear.

polyphasic sleep

polyphasic sleep Polyphasic sleep is a sleep pattern in which sleep occurs in multiple bouts across the 24-hour day rather than being concentrated in one long period.

Polyphasic sleep is a sleep pattern in which sleep occurs in multiple bouts across the 24-hour day rather than being concentrated in one long period. In the source packet, newborn lambs showed this pattern, sleeping during both daytime and nighttime.