When this happened with my daughter I let her sleep in my bed with two pillows. I wanted her near me so I could make sure she wasn't choking. Also I know it's basically the middle of the night (at least where I am) but you could buy infant saline solution to help the stuffy nose. Hope he feels better!!
i agreee with the vicks they make it for lil ones specifically, then i would prop him up. when my daughters were ever sick like that, it was best to prop them up to sitting. it looks unconformable but it does them a world of good