Is there anything different about using an iPod touch with Sleeptracker-24/7 instead of an iPhone?

Almost everything works the same. Minor differences: the iPod touch does not have a vibrator motor so the Get Active alerts will make a sound but will not vibrate. The iPod touch also does not have a proximity sensor for turning off the screen. On newer iPod touches running iOS5 or later, you may turn off the screen to save power.