My 13mth old has always been what I call a "good" sleeper. From about 8wks she slept through and most of the time has been a good self settler. The last few months has seen her in bed at 8pm, and sleeping until 8am or so. The last 4 nights though she has cried herself to sleep. The first night we thought it could have been teething so gave her the gel, which didn`t work, then later on Panadol which also didn`t work. We were going in to her every 10-15mins because her cries turned into hysterical screaming. After a couple of hours, we just left her and she cried herself to sleep after about 20 mins or so. Second night we only went in a couple of times, then she cried (ie.screamed!) herself to sleep in about 30mins. Last night we put her to bed wihtout continually going in, and she`d gone to sleep after 25mins - but again, crying and screaming. Once she goes to sleep, she is still sleeping through, but it is very upsetting for her as well as myself and my husband. Could this be separation anxiety at this late age? If so, any tips? If not, any other ideas what it could be? She is still herself during the day - very happy, eating well, still having 2 sleeps of up to 2hrs a day.