I struggled with my mums sundowning for ages until someone told me about this aspect of the illness. Knowing has helped me to cope. It's often a time of day when we're left to cope alone which doesn't help. I agree with posters who have said maybe the gp or memory clinic could prescribe something for the agitation. I introduced mum to colouring books and it's been amazingly calming for her.we do it together whenever things need calming down.