Snap! My mum is 83. Like yours, she was home alone for a while and was not sleeping through the night.
She slept till 6.30 am, unfortunately I did not sleep so well, the rain kept me awake and then one of the cats brought in a mouse - alive - so spent an hour trying to catch it and put back outside. Think by 2.30 I was asleep. Did go back to bed after I give mum a cup of tea and biscuits, slept till 9.30 and let mum just potter around the house. When she wanders in the morning, it is so different from the evening, no confusion, no pestering the dog or emptying drawers and moving things around, just pottering.
There has been a change since I increased Mirtazapine to 30mg and now taking in the afternoon, seems to have cut down her obsession with to and from the garden gate and some of the furniture moving has stopped. All in All less obsessive behaviour.
So last night no sleep aid worked, but think tonight I will have to look at the medicine cabinet, try and find a suitable cocktail, will start with all the smells and then a bath. Hopefully by 10pm she will be asleep.