Does the rich really sleep well?

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"According to an recent report (American Journal of Epidemiology, June 1st, 2006), sleeping comes easiest and lasts longest for the wealthy, white, and female. Researcher Diane Lauderdale followed the sleep habits of 669 Americans aged 35 to 50 and found that those with yearly income of less than $16,000 spend longer in bed than those making $100,000 or more, but they sleep less (...a lot to worry about), so there is this "Sleep Efficiency" difference between poor people (68%) and rich people (85%)." We encounter many research reports resembling the above . But it looks absurd . My experinces tells different story . I myself am a very low income people . But I sleep very well . Not only myself but others in my family also have a good sleep .On the other hand some of my rich acquiaintences who have reasons to remain tense around money matters have bad sleep almost regularly . Does your experiences support the research finding given above?Or do they refute it ?