To everyone thinking about using caffine or other drugs to combat sleep: all of the latest sleep reseach would suggest that 'optimizing alertness during sleep loss' is a fool's errand if what you want is productivity. The real goal must be to ensure you get enough sleep, not that you medicate yourself with caffine to stop your body from getting sleep signals.

Think about it this way: If prolonged sleep were not absolutely essential to your survival and health, sleep would be the biggest mistake evolution has ever made. an animal spending 1/3 of its life unaware of it's surroundings is an incredibly steep evolutionary price to pay. It should be obvious that if we evolved to do that, there would be gigantic benefits to it, considering htat there is not a single known animal with a nervous system that does not sleep (including insects!). If caffine was actually helpful at reducing your need to sleep, an animal would have evolved by now to endogenously produce caffine.

There is a substantial body of sleep literature now showing huge benefits to physical / mental performance, willpower and creativity from sleep. Don't fight it, use it.

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Edit:

One statistic thats particularily compelling to me: Every year during daylight savings when everyone loses an hour of sleep, the rate of heart attacks rises by 25%. On the day of the year where everyone gains an hour of sleep, heart attacks fall by 21%. Thats the effect of gaining / losing a single hour of sleep.