The cause is someone like 27-year-old Tamara Rajah, the one on the far right on our cover. Tamara is the youngest engagement manager at McKinsey's London office, has a First from Cambridge (she went up at 17), an MBA with Honours from Wharton, she runs her own womenswear business and, while studying for her MPhil at 20, co-founded a company that developed a prenatal genetic testing kit. What does she do at lunchtime - discover a cure for malaria? When asked her secret, she replied: 'I don't sleep much.'
Well done to all those who have made the list this year. '35u35' is one of MT's proudest achievements, and long may it continue into its second decade of existence.
Another woman who probably has to get by on little sleep during la crise economique is Laurence Parisot, the boss of Medef, the French equivalent of the CBI. France may have a tricky reputation as a place to do business - with kilometres of red tape to hack through and a dodgy habit of employees holding their bosses hostage if things cut up rough - but their productivity is better than ours, their economy is larger and they won't let foreigners buy their best (or their less impressive) companies.
Laurence Parisot is a pretty cool Iron Lady - she runs her family-owned furniture business, a polling firm called Ifop, gets involved in stand-offs with Sarkozy, plays jazz piano and runs Medef for no salary whatsoever. She has also received death threats - not, thankfully, part of a day's work for her UK equivalent, Richard Lambert.
This year, there will be no August edition of MT. But that doesn't mean we're disappearing for the summer - our soon-to-be relaunched website will be firing on all cylinders at www.managementtoday.com. And, if you haven't already, please sign up to our highly acclaimed daily bulletin, www.managementtoday.co.uk/newsbyemail.
And, if you're having some well-earned time off, don't worry about feeling bored. There's no harm in letting your mind wander, as our feature on boredom advocates. With your neurones in neutral, some of your most creative moments may occur. So abandon cerebral stimulants, put the wretched BlackBerry or iPhone 4 to one side and, in the words of John Lennon (but without his chemical assistants): 'Turn off your mind, relax and float downstream.'
A thought for the uber-busy Tamara to take note of.