Experts tell us that pulling "all nighters" rarely are effective in raising test grades. Newer research tells us that the best way to increase alertness is to drink a cup of coffee and then take a 15-20 minute nap. The nap clears the body of sleep inducing adenosine and gives just enough time for the caffeine to hit the blood stream.
Source:Psychophysiology. 1997 Nov;34(6):721-5.
Suppression of sleepiness in drivers: combination of caffeine with a short nap.
Reyner LA, Horne JA.
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