I have been living with my mum who was diagnosed with Alzheimer's aged 81. She is now 87 and showing signs of deterioration in her memory. She is on tablets and seems to have been ok - but the last two weeks it is like a switch has been turned on and she has completely changed. I need some advice if other people have experienced this deterioration so quickly and could it be because her routine was changed that week. She had antibiotics incase it was an infection. She is spending more time in bed and does not want to engage in anything, is this common?