Mom, who is 92 years young, is still functional but has early stage dementia, is awake all night and sleeps all day. She has always enjoyed walking and is now trying to do it in the middle of the night. We had the alarm system set to sound when an exterior door opens, but she still insists on leaving the house. If we could some how lock the doors in a way she could not unlock them at night, it would prevent a daily heated discussion. I have even said that the bears, which are in the area, feed at night. She initially stopped trying to walk but eventually that didn't work anymore. Putting locks up high won't work, she will get a chair or something and attempt to climb up onto it. I sleep on the couch at night so I am available to help when needed, but she insists on taking "her walks". We live in a rural area and there are no street lights, curbs or sidewalks. It is very dangerous for her to be on the roads when it is dark. There is no reasoning with her about the danger, she simply says "I don't care, I'll be fine". We have attempted to change her sleeping habits to no avail. We bought a recumbent bike which she used several times and and then said " I want the fresh air". I am hoping that if we can secure the doors, she will eventually realize walking at night is not an option. Any help would be greatly appreciated!!!