Lack of Sleep

I am not sure which one will be harder, waking up during the night with Miss ada every 2 hour because no medicine will keeps her sleep through the night, or I have to except that i cannot do anything about it and arrange for a nurse to come in at night to be with her, so I can sleep. It had been more than 2 years now and only it is hard on me physicly, but also mentally. 
And trust me, we had tried just about any medicine known to man that would help with sleeping. It is normal, like 99.9% of people with brain injury to have ploblem with sleeping. I just hope that she is the 0.01%. More option will be explored to help Ada, and me.
I do not need a lot of sleep, may be 5 or 6 hour straight would be enough, but waking up every 2 two hours is killing me. As you can see it is 5 am now and I cannot go back to sleep because I know she will wake up again soon.
Overwhelming with such hopeless feeling right now.