It what is probably our first (and only) public service announcement, we say: Go Outside! Get some fresh air. Turn off the computer.
More to the point: Go watch the Leonid meteor shower tonight. Experts predict it will be one of the most spectacular celestial events for quite a while.
[Update 11.18.2002-18:35 EST] Here’s a whole mess of info on the Leonids from SlashDot.