My daughters are 11 and 9 and every time they come back from weekend contact with their dad they are exhausted and feel ill. They are going to bed there between 10.30 and midnight when they have an 8pm bedtime at home. They have missed school due to this on a few occasions. My ex in the past has told me it's none of my business and that they're bedtime at home is too early. I think it's very much my business if they are so tired they feel ill and miss school the next day but I don't know how to solve this problem. There is a court order in place and they have to go to contact. What can I do?