Sorry you are awake at this time, everything seems worse at this time doesn't it? I know it must be so hard for you when your lovely wife doesn't recognise you, but I'm sure as others have experienced on here they will be times even maybe just a fleeting glimpse that she knows you are a person she can trust and knows well but is unable to put it into words or actions.
It must be so hard, I know when my mum asks who is J**** and its me it hurts , but it's the blasted disease that seems to be winning some days isn't it.
I'm sure June is grateful for the 61 years you have been together, my parents aren't far behind you. But unfortunately they both have dementia so I dread to think how it will end for them. At least you have had the time to ensure you did you best for her before she went into a care home, and managed to choose a home for her and she felt reliant on you which is a compliment to how she felt about you. I'm sure she still does but is probably just as frustrated as you feel. There will be sunny times still to come I'm sure.
You keep fighting for June,and check she's doing okay and visiting her and I'm sure you will see a smile or a wink when you least expect it. You can't give up June wouldn't want you too, the same as you wouldn't want her to if the roles were reversed. Take one day at a time and be kind to yourself.