Sir Isaac Newton

Sir Isaac Newton needed 3-4 hours of sleep daily.
He worked so long and hard, often without sleep for days that he became ill from exhaustion.
"He was suddenly struck by an amazing thought. Perhaps the moon was trying to fall to earth (a much larger mass than the moon). Perhaps there was some other force preventing it from doing so. What if the centrifugal force pulling the moon away from the earth was perfectly balanced with gravity force pulling the moon toward the earth? If that were true it might also account for the movement of the earth around the sun, in fact all the planets. How about the entire universe? Wow! What a concept. No wonder he couldn’t sleep."
Lifetime: 84