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Early risers
wake up early because of their body
. Most people are still in
sleep. Researchers said early risers share
with Neanderthals – our
from 40,000 years ago. They lived in
Europe and Asia. They woke up earlier to gather food as the
rose. A researcher said our body clock can change with the
of different
. He said a "faster" body clock makes people "more
to rise early".
