Father with dementia is not eating or drinking and wants to sleep. Is there anything I can do?

Just a few days ago my father was pacing around day and night folding and unfolding clothes but he ate and drank. After all the pacing he became exhausted and went to bed and kept sleeping. When I wanted to give him something to eat or drink, he clamped his mouth shut and refused sustenance. He continued to sleep. I apprised the doctor of his condition. My father is 95 years old. Should I ask the doctor about hospice at this point? I think we are losing him.