Born to nap
August 15, 2008
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Most mammals sleep for short periods through the day. We have consolidated sleep into one long period, but the biological vestige remains. Our bodies are programmed for two periods of intense sleepiness: from about 2 a.m. to 4 a.m., and in the afternoon, between 1 p.m. and 3 p.m. This midday wave of drowsiness is not due to heat or too many fries at lunch. It arises from an afternoon dormant phase in our physiology, which diminishes our reaction time, memory, co-ordination, mood and alertness.
Toronto Star
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