Make a comfortable and safe sleep environment.
The person's sleeping area should be at a comfortable temperature. Provide nightlights and other ways to keep the person safe, such as appropriate door and window locks. Door sensors and motion detectors can be used to alert family members when a person is wandering, as can safety systems like Comfort Zone.
Read more: http://www.alz.org/care/alzheimers-dementia-sleep-issues-sundowning.asp#ixzz3VkN0ab6Z