Does dd have day sleeps? my DD was like this from about 15mths and I ended up really resenting bedtimes, so we dropped her day sleep and picked up a firm night routine, dinner 5-5.30, small run around with her brothers then 6.15 bath/ shower and bed time story, milk and sleep (with a dummy) shes normally out like a light. If she has a day sleep we need to adjust for a later bed time