Anyone breastfeed and use formula at night time to help keep baby full longer?! My daughter still wakes up every 2 hours or less (she's almost 9 months now) to nurse and refuses to drink milk if I put some rice cereal in it but I let her try formula once before and she had no issue with it and I heard formula fed babies sleep longer because it's more filling...I feel bad for doing it but this week I have 12 hour days coming up plus a 2 hour drive each way and I would really like to get more than a few hours of sleep.