DS just started in Year 1 and has always been amazing at going to sleep at around 8pm. He's at school all day and has various after school activities, swimming, tennis, drama and for the last week he has been totally unable to fall asleep before 9.30pm. He has also been having massive tantrums, crying, screaming, thrashing about, he's very emotional and angry. I wondered if anyone else has experienced something similar at the start of Year 1. He's a May baby so in the younger half of his year.