Apple Clock

How To: Use the Bedtime Clock on Your iPhone to Make Sure You Always Get Enough Sleep

Since the days of flip clocks, alarms have always had one function—make a bunch of annoying racket early in the morning to ensure that you wake up in time. And this simple MO has stayed in place while technology advances at a breakneck pace, almost in spite of the fact that today's devices are capable of doing far more than beeping at 7 in the morning.