Here's some tips. They don't make it perfect, you'll still APOP a bit, but it may get you longer stretches:
*Elevate the head of the crib, you can put a pillow under the mattress on one side.
*Vicks makes a vapor rub suitable for infants, put on chest and I also heard on the soles of the feet and cover in socks. Not sure how much it helps but it couldn't hurt right?
*Use a vaporizer in the room
*Run hot shower and sit in bathroom and let her breathe in steam
*Saline nose drops and/or the bulb suction thing to suck out snot/boogies. They HATE this though and will cry and carry on generally, but the saline things out the mucous and the suction thing pulls out excess and clears it a bit
*Avoid milk based things as much as possible, like yogurt, etc. as they seem to thicken mucous a bit. I try to give DD diluted juice and or just plain water before bed as opposed to her normal milk. I figure it's not forever so it's okay for the short term
*When she does wake at night, hold her as upright as possible to help "drain" the fluids. You know how you get all stuffed on one side and roll to drain and then it gets stuffed on the other side, I feel like it takes awhile to drain when I get up in the morning when I am sick, so the same must be happening to them.
Hope this helps a bit!