Hey Soapie, my girl has that now. And she's just a mere 1.5 months old baby. Poor her has to go for nasal suction which pipe have to go through the nose and mouth, you know what I mean? It was totally heart wrenching. She was trembling occasionally in her sleep. dont't know how long this may go on. But my parents and I suspect that she is in fear which the pipe have to go through each of her nostrils and mouth to suck her mucus and phlegm.
I would suggest you to elevate her pillow higher try your best to refrain the water in her nose to flow back and choked her throat. Let her drink some water before sleep also helps for my case.
Lastly hope she get well soon.