18mo not sleeping through the night. Is there anything I can do that I haven't already?

My son is 18mo, and he sleeps entirely through the night once or twice a month. The rest of the time, he is up at least once at night, but usually twice. He was sleeping through the night from around 9-14mo, and then around that point he started waking. He will push all of his like 6 binkies out of the crib, and then wake up crying, or he will wake up coughing and then cry (we have a somewhat dry house but I try to run the humidifier in his room often). He doesn't nurse anymore, he just wants to be held. I'm at my wit's end, I can't deal with this lack of sleep at an age where he should be totally sleeping. I do everything I can to keep him comfortable (comfy clothes and what I feel is a good room temp, set up a good routine for him, giving him a lovey that he's used for months, etc) and I don't know what more I could do. via /r/Parenting http://ift.tt/2y7W32b