My LO has an issue with waking up and feeding for a bit then falling asleep, despite my best efforts to keep her awake. This inevitably leaves me with a half drank bottle of formula or EBM. A half hour to hour later, LO will wake looking for more food. It's frustrating because milk supply is low and I don't want to waste any. Is it safe to continue giving her the same bottle? What are the rules with this? Also, any tips to keep her up during initial feeding would be appreciated. TIA!