My mum does this too,she's also at the same level as yours both too,also has this obsession in wanting the toilet (she has a permenent catheter!)and also checking to see if we(she lives with me and my children)are in the house! This happens throughout the early hours and continues until mid morning when she will nod off for an hour.
The medication she is currently on as a trial for the past week,has little effect-so I'm going to discuss with the cpn about trying something else,as this issue will surely be the cause of my mum going into a care home.. I always thought the double incontience that dementia sometimes brings,would be that turning point,but no,I have gotten used to cleaning up the mess,it's the lack of sleep that is making me ill,and possibly edging into menopause,I really do feel rundown.. I'm sorry I can't be much help,but I would urge you to ask your cpn,or GP for help,medicine wise there may be something to suit your mum and ease things hopefully for you too.
Sent from my iPhone using Talking Point