I don't think it's hunger either but possibly, thirst since teething makes them droll a lot, therefore loosing important quantities of water through that. Would he drink from a sippy or bottle? if so, you can offer him some plain water for his thirst. Also try some pain aids before bed so he won't wake up from pain. Sometimes the pain makes them have a light sleep, therefore waking at any sight of thirst, wet diaper etc. WIth a deep sleep that wouldn't happen, so to prevent any wakings, try some tylenol or motrin before bed till the molar is out and you're positive there are no others on its way. You can use tylenol on a dialy basis for two months. Motrin is harder on the stomach so i just use it for the "week crisis" of teething. Also ask your ped if he ok's this.