However, stress can also trigger the onset of hereditary hair loss and accelerate its progression. “In those susceptible to male pattern baldness or female pattern hair loss, stress can instigate, accelerate and aggravate the problem,” Leonora says. - See more at: http://www.belgraviacentre.com/blog/lack-of-sleep-can-cause-hair-loss-082/#sthash.NWhhn2NV.dpuf