My son wakes during the night all night.

We are still waiting to go back to have the autisum assessment for the second time and my son is now 9 and we struggle. The hardest thing at the moment is he is waking constantly in the night very stressed and angry that he is too hot. When the house is not hot at all. He cant get comfy and non of his covers are right for him. He doesnt want my advice and help he just wants to stress and have me stay with him. It causes agression and his brother in tears as they share a room . 

I dont know what i can do for him. I give him wet flannel and try do deep breathing with him but he doesnt respond. I consider  sensory type blankets but they so expensive an im sure he would say it does not feel right. 

Any advice greatly appreciated.