Until he's skipped too many meals and too much sleep and tapped so many of his reserves that here's almost nothing left?

From the ages of 17 to 25, sleep needs are greater than at any other time of life after early childhood, but the pressures to postpone or even skip sleep are also greatly increased.

Whether cold fusion proves to be a nearly endless supply of cheap energy or one of the greatest scientific delusions of recent times, it is now the hottest of scientific topics, so stimulating researchers that they often put personal lives on hold and camp out in labs, skipping meals and sleep.

And I hope you haven't become so wrapped up in this yourself that you're skipping meals or sleep.

Like all of Sky Domes' senior engineers, he'd been skipping sleep, meals, and baths, and his own exhaustion showed as he blinked owlishly, then ran one hand through the oily tangle of his thinning black hair.

Emily Spendlove, 35, drove 45 minutes to wait in line outside the Fashion Place Mall on Thursday night, skipping sleep "to be part of the excitement."

I'm used to skipping sleep on the road.

But even as most students routinely skip sleep, they are not giving up opportunities to gripe.

She'd skipped sleep and food and company because she couldn't bear to put down the brushes.