[djmcmath]

You might try taking up a career in nuclear submarines. After a qualifying deployment, you learn to consider 2 hours at a shot a long time. 4 hours is considered a lot of time. 6?! Ha! This kind of inhuman sleep cycle is maintained by fantastic quantities of caffeine. Submariners are actually just a little famous for the hyper-caffeinated twitch.

If you are inexperienced at this, you may find that less than 6 hours a night will cause serious problems. When I first started sleeping like that, I was ok for the first month or so, then I started passing out routinely. It was a real bummer. I'm much better now -- I did 22 energetic hours last weekend before I realized I should have been tired, then slept for 4 hours to recover. For serious starting points, I'd recommend a good exercise routine and a really healthy diet. I'm always amazed at how much more alert I am when I cut back on greasy foods.

BTW, what's your motivation?