My mother has Alzheimer's. She's only been diagnosed for about a year but I'd say she's already about midway in the seven stages. But only a month ago, when I visited her at home in North America, she recognised me. This month, having coming with my father (who is determined to tick off her bucket list) to visit me in the UK, she doesn't have the slightest idea who I am. She is still loving, so I'm not saying I'm upset. I'm just wondering, how much do people think this might be jet lag? On the other hand she's already been here a week. Might it reverse when she goes home? What do we think?