Before revision: A man napping in a hammock, on a patio in Costa Rica Need not be necessary A nap is a short period of sleep, typically taken during daytime hours as an adjunct to the usual nocturnal sleep period.
After revision: A man napping in a hammock, on a patio in Costa Rica A nap is a short period of sleep, typically taken during daytime hours as an adjunct to the usual nocturnal sleep period.