My 2 and a half year old twin grandsons rise at between 5 and 5.30 a.m. I don't do the early mornings, but my poor daughter is thoroughly exhausted by the time she gets them to nursery around 8.30 (and then goes to work). They are super energetic in the morning. They go to bed around 6-7 in the evening with no fuss, they are usually really tired by then. They also have about an hour to an hour and a half nap at nursery. Any suggestions so they might sleep later? Their mother says keeping them up later doesn't make a difference. She is a single mum, I help her out but she is finding it a struggle. Thanks.