Hi
@Chris100
With you being asleep, it meant your wife was alone with her thoughts - this can cause a PWd anxiety, of course, if it's for any length of time - that's why she went to the neighbours. Maybe, for a moment, she might not have recognised you, as you were asleep (just a thought).
Yesterday, I stayed upstairs for a bit too long, I heard my mother go into the garden (the garden gate is locked). Realised, and made my way downstairs, she met me on the stairs - "Where've you been?"
"I told you I was going upstairs"
"You didn't"
At night it's not so bad, she gets up about once or twice, I normally have to get up too, if I hear her from my bedroom, to reassure (sometimes not, in latter months, actually). Things will probably get a bit better for your wife.