Night time phone calls

[Chelmew]

90 yr old DF In good health. lives alone. Carers come in to give meds and make a sandwich- I do all other life admin- i have posted about him before
Following assessment from doctor he's in really goods health (for his age) No dementia - just age related cognitive decline.

Our main issue currently is his lack of time awareness- eg. last night he phoned at 1.30 am wondering where his lift was. - he was being picked up at 1.30 pm. We have tried dementia clocks which say night time/day time etc - he can tell me what time it is but he doesn't believe what the clock is saying - also its dark outside but he can't seem to relate that to the time of day.

My concern is that he has started going out on his own at night eg to the corner shop thinking its day time which is dangerous. (Also that he is phoning me in the middle of the night to tell me the shop is shut and i am knackered !!)
Anyone else experienced this and has any useful strategies to manage it?

Thanks

Thanks @Poppy61 💐
that sounds really positive. I’ll ask the doctor about this if he gets another.

MIL used to wander at night, and after a neighbour’s doorbell capturing her trying to break in with a teaspoon in the middle of the night DH put bolts on the garden gates so she could get out and prowl the garden, but not out-out. Only worked because bolts foxed her, and the carers could reach over and let themselves in. We were lucky that she didn’t take to making a noise while she was out at night. It’s so hard, I hope you find a solution OP.