Even if you can't fall asleep for a nap, just laying down and resting has benefits. Studies have found resting results in lowered blood pressure, which even some college kids have to worry about if they are genetically predisposed to high blood pressure.
Foregoing sleep by cramming all night reduces your ability to retain information by up to 40%. If you can, mix in a nap somewhere to refresh your hippocampus.
The way this works is you drink a cup of coffee right before taking your 20-minute or half-hour nap, which is precisely how long caffeine takes to kick in. That way when you wake up, you're not only refreshed, but ready to go.
According to Dr. Sara Mednick, the best nap occurs when REM sleep is in proportion to slow-wave sleep. Use her patented Take A Nap Nap Wheel to calculate what time of day you can nap to the max
For people ages 18 to 24, sleep deprivation impairs performance more significantly than in other age brackets.