Transitnap!

Ever wanted to take a nap on your way to school, work or home, but you were afraid you would oversleep and miss your stop? With Transitnap you can take a nap and be woken up near your destination!
You can save your most frequently visited destinations and you can also quick-pick one from a map. You can configure your alarm to make sure wake up how you want. You can set how close you wish to be woken up, as well as the alarm sound, vibration or snooze. You can enable Wake on Warning, so if your battery gets low or your signal gets lost, you'll be warned and woken up. You can also use your headphones, so you don't disturb anyone else and you can use the app with your screen locked, which preserves battery.