so wanted to know am i charging my iphone 4 correctly....which is everyday after college would be around 5pm and will come back and charge till the next morning 8am then go to college....but in between sometimes at nite i will go out which i wont get to charge my phone around 8pm-12am/2am maybe then will continue charge till the next day 8am...and also i keep on sync with my itunes and charging it together...do i over charge it? will it reduce my battery life span?