<http://schema.org/about>
"Women are more likely to be morning-people than men. Their circadian rhythms, which modulate sleep-wake cycles, are shorter. This could be linked to the increas"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/health/fitness-well-being/stories/why-mom-wakes-before-dad>