Phone stuck on charging logo after charging it turned off

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http://forum.xda-developers.com – Hey guys! My phone died on me yesterday since I forgot to charge it the day before, it was dead in my pocket for 3 hours until I got home. Without bothering to do anything, I simply plugged my dead phone into the charger and went to bed. I woke up today, unplugged it from the charger and the phone stayed with the charging symbol stuck, I pressed the power button and nothing so I had to make a battery pull to get it to turn on. Any issue to what could have caused this? also any interesting battery saving tips? sprints crappy 3g network in my area is draining the battery quickly so I turned o (HowTos)