"In fact, 43% of those responding to NSF's 2001 Sleep in America poll report that they are very likely to use caffeine when sleepy. Scientists say that when used in moderation (about 250 mg a day), consumption of caffeine poses no harm. Therefore, drinking a couple of cups of coffee or a few cans of cola a day poses no harm, as long as they're not ingested too close to bedtime and do not mask chronic sleepiness caused by too little sleep or poor sleep. If you have a question, talk to your doctor. "
The National Sleep Foundation's Caffeine Calculator shows that even two 12 ounce cups of brewed coffee is far in excess of the recommended 250 mg limit on caffeine for good health. By my calculations, I need to cut down to a 12 ounce latte or cappuccino in the morning, and a cup of tea in the early afternoon. That yields about 240 mg of caffeine, and still gives me a little caffeine boost at times when I tend to feel sleepy. I will have to see how it works in practice.
12:10:20 AM 
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