Jason Fried:

Lately, I’ve been hearing something that disturbs me. A lot of entrepreneurs onstage have been bragging about not sleeping, telling their audiences about their 16-hour days, and making it sound like hustle-at-all-costs is the way ahead. Rest be damned, they say - there’s an endless amount of work to do.

I think this message is one of the most harmful in all of business. Sustained exhaustion is not a rite of passage. It’s a mark of stupidity.