My previously brilliant sleeper has changed from sleeping all night long without a peep to now waking multiple times and impossible to settle. He has recently given his dummy to the dummy fairy, all went well for a few nights but started to wake and struggling to get back to sleep. Has since climbed out of his cot while wearing his sleeping bag so have had to move to a bed now for his own safely and all hell has broken loose. No problem going to bed, will fall asleep from wide awake by himself no issue, all talk about big boy and big boy bed etc. But he is wakening at least twice every night screaming 'Mummmmmm' at the top of his voice over and over again. I go in and settle him and two mins later it's the same, he just seems to wake and cannot get back over himself. Hes now been awake since 1am and I'm at the end of my tether. Any one any suggestions over how to deal with this?