I agree with you, Elegran.
I had someone coming in for two nights a week for the last 3 weeks just so I could get some rest, and I had to sleep/lie down and rest in the spare bedroom, so I would be okay during the day.
When Ken did die, our youngest son was here overnight, because he wanted to be.
I am sure the district nurse should be able to help with a night sitter, or even a day sitter, so you can just relax and not feel completely responsible.
They always used to tell me I knew better than any of them about his diabetes, and nobody else would give him injections. But it's a big responsibility to put on someone who is not trained.