prophylactic nap
n. A daytime nap taken to prevent tiredness later in the day.

Example Citation:
"Dr. David Dinges, a sleep researcher at the University of Pennsylvania, is a strong advocate of prophylactic napping—taking what he and others call a 'power nap' during the day to head off the cumulative effects of sleep loss."
—Jane Brody, "New Respect for the Nap, A Pause That Refreshes," The New York Times, January 4, 2000

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