Sleep testing performed on most of the patients found obstructive sleep apnea in 56 percent of them and insomnia in 49 percent.
More than two-thirds (71 percent) of the soldiers had restless nights of fragmented sleep. Nearly nine in ten (87 percent) were "hypersomniacs," sleepy during waking hours, Collen said.
Very interesting details in the results. Clearly shows differences in pathology.
Several different things going on.