Currently Being ModeratedJan 29, 2013 8:46 PM (in response to Lucyinthesky4260)
Your iPHone has an intelligent charging system. It will not hurt your iPhone to leave it plugged in over night every night if you want. I have an iPhone 4 that I bought in July 2010 (2.5 years ago), shortly after it was released. It has been on a charger over night almost every night since I bought it, and the battery will still last me just as long as it did when I first got it.