Sleep disorders and PTSD

In a new study, nine in ten vets with PTSD or TBI were "hypersomniacs," meaning they were tired during the day. That's because more than half had sleep apnea and almost half had insomnia. (It's not clear if those numbers overlap.)

Interestingly, the vets with no physical injuries suffered from greater levels of sleep apnea. TBI caused by blast injuries caused higher levels of insomnia.

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Sleep disorders plague vets with head trauma or PTSD | Reuters