My mum has Alzheimer’s and, so far has coped reasonably well. Over recent months she has become much more forgetful and is very aware of this. She tries hard to maintain her sense of humour and positive attitude but recently I have noticed that she is increasingly irritable and low in mood. She told me last week that she’s been having bouts of uncontrollable crying, for no apparent reason. Can anyone give me any insight into this and suggest ways I can reassure her.