At least it feels like she has given up. DH and I need to sleep train her, but I'm not sure where to begin. Any help or success stories appreciated.

She' 9.5 months and has 8 teeth. They've all broken through, so I don't think our issue is teething. Most nights, she nurses to sleep/drowsy and wakes up maybe once, nurses and goes back to sleep easy. At least one night per week for the last three weeks, she has a middle of the night freak out. This week it was last night. Woke up at 1:30, I nursed her thinking she'd fall back asleep. Nope. She was awake for the next two hours. Happy as a clam if DH or I was holding her. If we put her down, she flipped out. Finally got back to sleep after I let her fall asleep on me in the glider. I just couldn't handle looking at the monitor and seeing her cry while standing up in the crib.

So, we think we're going to CIO. I know she doesn't need to eat at night. She is a good eater during the day and she used to STTN (back in the glory days). DH is on board - he thinks her night sleep has gone to crap due to "preferences." We let her CIO on Monday for bedtime and she was out after 25 minutes and didn't wake until 4:30, nursed, slept until 8:15am.

Advice? I need to get through this and feel normal again.