This is an idea, like most, that came to me at 2am during a restless night. Like most Tasker creations it started with a simple problem. When I put my phone to sleep it goes silent till 5am, so what do you do if someone needs to reach you? What put the idea in my head was a text from my flat mate saying he’d left his keys at home and needed me to leave the door unlocked. In his case it was luck I was up late and got the text.