[etal]

1. In the middle of a long flight, compare pilots' reaction times just before the nap to just after the nap. Result: After the nap, reaction times are 16% shorter.

2. Over the entirety of a long flight, test pilot reaction times initially, then at regular intervals until the end of the flight. Result: Without a nap, final reaction times are 34% slower than initial reaction times.

Yes, it's a little bit of a factoid soup, and citations would have been nice.