Metro commuters can’t always count on the trains or buses to be punctual, but a new iPhone application that sets off an alarm if there are service disruptions can help riders still get to work on time. TravAlarm reads information from Metro in real time and wakes users earlier than their regular alarm if the transit agency has issued an alert for a service disruption along their route. The users can determine how much earlier they want to be woken — and can even “hit” a snooze button if they want to get just a little more sleep.