Early symptoms include not only that the memory of the affected person is declining, but also the waning of cognitive abilities indicates the onset of dementia. Depending on the type and course, various complaints may occur. Foremost among these is forgetfulness. Affected people no longer remember what they did or said recently. They also find it increasingly difficult to cope with simple everyday things that previously caused no problems. Orientation problems can also be an indication. Affected people can no longer find their way around their own environment or get lost on the way home from a walk or shopping. Other possible symptoms include speech and word-finding problems. Simple terms no longer come to mind, conversations become increasingly difficult. Fatigue and sleep problems are also not uncommon. Sleep patterns change – sufferers often nod off during the day and have trouble falling asleep in the evening despite being tired early. It hardly comes to deep sleep anymore. Often, this completely reverses the day-night rhythm. Probably the most stressful symptom for relatives, caregivers and acquaintances is the change in personality and typical behaviors of dementia patients. They become listless, apathetic, anxious or even spiteful, aggressive and have outbursts of anger. Others withdraw and no longer participate in social life as before. Affected persons themselves often deny mistakes, such changes of character and their decreasing abilities and do not want to admit the disease.