My father was diagnosed with advanced lung cancer six weeks ago. Between CT scans the cancer has spread quickly and the tumours in his chest and buttocks have doubled in size. He has had three lots of radiotherapy and two more to go (5 days total). He is having difficulty breathing now and appears to be gasping. We had a visit from a palliative nurse today and she is the only person we have seen at home. I read that breathlessness is a side effect of radiotherapy. Is it normal to be so out of breath while sleeping? I am trying not to panic!