DD1 is 3. She still has a nap in the day but recently she hasn't had it every day. However on the days she's doesn't have it she gets very tired and emotional. Her behaviour is really affected, negatively, by her not having that day time sleep. But even when she doesn't have it she doesn't settle to slew any better and she doesn't wake up any later the next day. Her nursery agree that she still seems to need that sleep. She also has breathing problems and a lower o2 saturation than is typical so she has to work that bit harder to breathe which is why I think she is so tired. Anyway, she wakes up between 5.30 and 6am every day. She wakes up energetic and wants to go downstairs and play right away but within a couple of hours she'll clearly be tired. If she could get an hour more sleep in the night I think it would make a massive difference but I don't know how to do that in as least unsettling way as possible - me and her Dad have recently separated so I don't want to do anything too extreme but at the same time, she needs that sleep all the more at the moment.
Any advice would be much appreciated.