PTSD is tough in that the individual is often stuck in the fight/flight mode which makes them very sensitive the way you describe. Honestly, she should look into taking an antidepressant as often that can bring her some relief. Yet, it takes a good three weeks for her to notice the difference where she is less hypervigilant. PTSD tends to be a constant battle with self as the affects of ptsd are intrusive and can be exhausting. I too have ptsd and what you describe would bother me too. Yet, I would not keep insisting you lay there quietly when it clearly makes you drift off and experience that period of half asleep and jerking awake which is normal. You may need to consider setting up twin beds in your room to sleep. Sometimes it just doesn't work out well to sleep together in the same bed.