The swing or a car seat is a good place for your child to sleep in if you have to keep them upright. Compromise and put them at an angle. You can also elevate their mattress a little to make them feel cradled.

Not well. If your baby has a reflux that means your baby cannot sleep on her back, otherwise she will cry all the time. So parents end up swapping who is sleeping with the baby on top of them, half sitting, while the other parent gets to sleep a little bit.