Dear Tamara,
I do know wht you are going through. My 47 year old brother hung on as well, fully sedated for the last few weeks of his life. He did not want to leave us. We waited for his last breath as well, it was agonizing. Sometimes I could not sit in his hospice room, holding his hand and hoping for a miracle. Then night before he died, I and my whole family were in his room, somehow we all just gathered at once, it was almost like he mentally summoned us. We were standing by his bed in a semi circle, then all of sudden he was trying to open his eyes, up until that moment he just laid there. Each one of us went up to him to say goodnight and he tried desparately to open his eyes and try to say something. The next morning he passed away. He knew when the time was here and so will your husband. He will know when it is time to give up and rest. My heart goes out to you and your family.