6. Lethargy
Dementia is likely to cause feelings of lethargy – extreme tiredness which may render the individual disinterested in their usual activities, might cause them to sleep in a lot, or might cause them to fall asleep.
Lethargy can also be a symptom of a wide range of other conditions though, so be sure to look for it in conjunction with other problems and to consider other likely causes. For example, lethargy can be a result of medication, and especially sleeping tablets or antihistamines. It can also be caused by depression, or by illness.