My mum is 86 and generally speaking in good health, although overweight and increasingly sedentary. Today she told me that she's spent almost all day sleeping. She went out at breakfast time, came back and lied in bed and has been sleeping for most of the day. This is very unlike her. She likes her nap after lunch but not straight after breakfast. She lives in my home country so I cannot just go round tomorrow to see her. Should I be worried? I keep telling myself that we can all have an off day every now and then but still...