The Rich Sleep Efficiently

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.
The image
Graphic from University of Chicago Magazine.

Me?  I have money but I sleep like a pauper.

Hat tip to Robin Hanson.