I think they also react to our stress. It has been a dreadful couple of weeks. My mum who is 87 and has dementia was taken into hospital with heart rate of 37 which at one point went down to 20. We thought she was a gonna. She then recovered but, despite us emphasising to the ward that she had dementia and would try to get out and 'go home' she managed to get off the ward unobserved and unchallenged, fell and cut her head open, which needed gluing, and broke her femur. So, at the age of 87 and after being so poorly she then had to undergo surgery. Touch wood, she is now on the mend and, hopefully, will go back to the care home on Wednesday.