I work with the elderly for the NHS, patients with dementia, alzhiemers, managing violence and aggression, and in the 14 yr I have worked there I have assisted to lay 8 deceased patients out ready for collection from the funeral director.
As others have said, we talk to them through out the whole process, wash them, clean sheets, open the window bit close the curtains. We also leave a side light on and in some instances a radio if the person was a particular music lover.
We often return to the room and we as someone stated, talk to them as we enter the room, walk round the room and as we leave the room, no different as to how we would had the person been alive.
The person is treat with respect and compassion, I have never been it a situation where the person has been ignored as it were, if in the caring profession it is second nature to treat the person this way. I have sat with people as they have taken their final breath and I have had a silent tear, we work with our patients over prolonged time and we get to know the person how they were before they got ill, we get to know the family and the new person the patient has become, so it is a sad time for us as well, a member off staff always attends the funeral as well.
I am so sorry for your loss OP. My Mam died 10 year ago when I was 25, she died at home, alone on her kitchen floor, it has taken me this long to be able to talk about it. All I can say is, time is a great healer though you will never forget, your memories will soon be of the good times and you will stop feeling that raw sense of loss. Take care OP 