According to a recent paper in the American Journal of Epidemiology the rich are more efficient sleepers. Not that they sleep fewer hours, in fact they sleep more than the poor, but their sleep latency, the time spent lying in bed trying to get to sleep is lower than for the poor.
Graphic from University of Chicago Magazine.
Me? I have money but I sleep like a pauper.
Hat tip to Robin Hanson.















Is this one of the causes or an effect of them being rich, however? I’d argue for the latter, they don’t worry about what to eat tomorrow as much.
I think effect too – maybe those with less economic insecurity have less to worry about. There’s nothing to keep you tossing and turning like the fear that you can’t heat the house in the middle of winter.
Oh, or fewer kids.
More time in bed and less time sleeping? Obviously, the poor are having more sex.
Fewer kids…more nannies…
Also, is time in bed watching TV counted? If so, then it’s all explained. Poor people are more likely to watch TV in bed as opposed to do other activities that cost money.
Holy Just-So Stories, Batman!
I think being able to afford comfortable beds is going to play a large part in this. A good mattress is NOT cheap.
Sorry, I was wrong about the effect of age in the study:
“followed the sleep habits of 669 Americans aged 35 to 50 and found that those with a yearly income of less than $16,000 spend longer in bed than those making $100,000 or more, but they sleep less because their “sleep latency,† the amount of time spent lying in bed awake, stretches to nearly an hour.”
I wonder what % of the >100k folks have an Ambien prescription?
This is probably a correlation of incomes and job types.
Think about non-work hour productivity. Low wage work requires actually being at the job site to be productive – scan this label, count these boxes, move these boards. But higher wage work can be made more efficient by thinking about it away from the job site – you can brainstorm in your car, decide business strategy at dinner, and solve engineering algorithm problems in your sleep. Middle income work can be addressed only in part away from the job site – you can solve financial relationships in bed, but you still have to do the math with the actual numbers in the office.
We can test this. If I’m wrong, then union memebership would have no effect on the correlation. But if I’m right, then the more union participation, the less strong the correlation (because union wages are higher than non-union wages, especially in low income job categories). Do you know where to find historical sleep efficiency data?
But what’s really interesting is the blip in hours sleep for the 35-50k/yr crowd. Are they working more for less per hour?
So what’s the direction of causality here?
If I get a CPAP, and it helps me sleep more efficiently, will I get richer?
liqingchao 07年8月21日
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