My ds is nearly 20 months and has been waking screaming every night for the past 2 months. He has been sleeping through for 10 months now so unsure why hes suddenly waking. He screams at the top of his lungs in the middle of the night sometimes constantly for over an hour. Nothing seems to comfort him. He is understandably exhausted at nursery the next day as am I at work with very little sleep. Also cannot settle him back into his own room once hes uo screaming. I move him into bed with me and sometimes he settles quickly but most times the screaming continues. He is also banging his head forcefully off anything when he is told no or doesn't get his own way. Really unsure what to try next to get him sleeping through the night again