Light entertainment: famous people, sleep, publication bias

Bernard L. tipped us about this "infographic":

The chart is missing a title. The arcs present "sleep schedules" for the named people. The "data" comes from a book. I wonder about the accuracy of such data.

Also note the inherent "publication bias". People who do not follow a rigid schedule will not be able to describe a sleep schedule, thus taking themselves out of the chart.

Comments

[Bob H]

What's with the black background on half the chart? Where I live it is (roughly) dark from 6am to 6pm, not midnight to noon.

[Matt F]

Also eg Beethoven and Simenon had exactly the same schedule - but there's no way of telling that by glancing at the chart