A comment I saw on an fb status: “Alarm clock. I dare you to think of another gadget specifically designed to kill dreams.” But it’s not just the literal alarm clock.
There’s also the daily or weekly figurative alarm clock; the thing that has to be done, by a certain time, some externally imposed requirement, that interrupts or prevents you from doing what you *really* want to do.
And of course the existential alarm clock. There’s an alarm clock … waiting for you. Don’t let it kill your dream. Time is short. Do it now.