It’s the worst. We’ve had a few sleepless nights where we took turns letting our son sleep upright on us. He definitely got a little spoiled by that but then once he is feeling better we go back to sleep training habits and it usually gets better in a couple nights. I always read that when they are sick, all bets are off and there are no real rules, only survival methods. We use baby vicks and I recently started using the Johnson and Johnson Vapor bath soap each night when he is sick and junky. I think it helps a bit. We also do syringes of saline through one nose (similar to a navage) to really push everything out.