When the power goes out and the phone dies, notice what you reach for first. A book, a person, a flashlight, a nap.

Take the usual options away and real preferences surface fast. A blackout removes the default, so the next thing you reach for is chosen rather than automatic. Whether you reach for a book, a flashlight, somebody to talk to or sleep, it says something about what the phone has been standing in for. The answer is a hint rather than a verdict.

You do not have to wait for a power cut. Put your phone in another room for an hour tonight and watch where you drift. Let the first ten minutes of restlessness pass, then do more of whatever you found yourself choosing.