Having got home from work I received an anxious phone call from dad, mums carer, to say that she had slept from 10:30 last night to 1:30 this afternoon. He had woken her for 'breakfast' and after a bath and hair wash this afternoon she said she felt a bit dizzy and laid back down in bed. She then went into such a deep sleep that my dad couldn't wake her. He phoned me asking what he should do, she was breathing but he couldn't rouse her. He called emergency services who sent a first responder who said that this is a normal, but not common development of Alzheimer's. Has anyone else experienced this? I quite expected this to be the end when I arrived after a 30mi drive across town in the rush hour traffic. Mum is physically very fit but when does the dementia interfere with physical wellbeing?