My Grandma starts "Sundowning" at about 11:00 am everyday. Normally, this is something that happens to most dementia patients later in the day or evening. I haven't been able to pinpoint any specific triggers for her sudden personality shift, but it's like clockwork every single day. She will however, lighten up, become more engaged and happier later in the evening/night. Usually, about an hour before she goes to bed, she will suddenly perk up and become very talkative. It's pretty much the complete opposite of typical Sundowning behaviors. Has anyone else experienced anything like this with there loved one/patient?