My parents are taking care of my grandmom who has dementia at home since two years ago (before that she used to live alone but it has become impossible). When I visit, I noticed that she always gets obssesed with looking for her nightgown in order to go to sleep, sometimes even at 2 pm or earlier. If my parents do give it to her, she goes to bed no matter what time and does not sleep at night, impeding the sleep of my parents and they have to work, so they try to establish routines and schedules for going to sleep. However, once she gets obsessed with getting the nightgown, she might keep asking for it for hours until night time and it obviously stresses her out and my parents as well. Distracting doesn't seem to work as she then projects her anxiety to another topic, such as for example preparing the bed for me, even though I don't plan on staying. Whatever explanation or reply is given it seems to trigger another anxiety, and it's a vicious circle and I can see my parents losing their temper which I feel causes even more anxiety in my grandmom.
They feel that they need to take care of her at home, but her behaviors drive them crazy (and I'm not suprised), so the environment is not always positive.
Are there any advises I could give them on dealing with anxieties and obsessions?