People living alone who do not have any care are susceptible to many instances of health and danger problems which can happen during the night. Most people these days have mobile phones. If they don't "wake up" then they may not be "discovered"!!!
My idea is that an app be developed which would allow friends to be able to contact each other on a regular basis (perhaps daily) by simply asking them if they are ok. This would mean setting up a group of contacts by mobile phone number only and pressing a button which will message each person on your contact list and simply ask if they are ok. Also I suggest that this app has a location id as well as a longitude and altitude id. The location should identify "home" as well as current location. It should also have a 000 ability in case of an emergency eg: heart attack.