Third person singular present tense of 'alternate': switches back and forth between two or more things.
From Latin 'alternare,' meaning to occur or happen in turn, derived from 'alternus' (every other, alternate).
Your brain alternates between two hemispheres during daily activity, but this alternation reaches its peak during sleep when REM and non-REM cycles create predictable patterns—disrupting this rhythm causes the fatigue of jet lag.
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