Just curious what you do...

When your baby wakes in the middle of the night and won’t go back to sleep. My girl is 7mths, and usually all it takes is to pop her soother back in and she is back to sleep. Tonite, nothing is working. She has been up almost 2 hours, and no sign of sleep. I have tried changing her, repositioning her in bed, checking for anything uncomfortable, giving her a blankie to hold for a bit, and finally feeding her (she hasn’t done a night feed in months). I’m at a loss.