Helping child who is not coping well with school

My son will be 6 next week and is in his second year of school. The first year was more play based learning, but this year is much more work. Since going back to school after Christmas he has been struggling.He has been tired and tearful at home, although he goes to bed at 7:30 and wakes up naturally around 7am. Any attempts at going to bed earlier than this just result in tossing and turning until "normal bedtime" rolls around.At school the teacher says that his behavior is good but he has taken to sometimes lying down when they are meant to be having playtime outside. When she spoke with him, he was teary and asked to be by himself after explaining that he was just really tired.Tonight he told me that when they were asked to get their writing books out he started crying, but went out to get a drink and calm down, and then went back to his work. He said he didn't know why he was crying, but he has in the past complained about feeling "stressed" (I am not 100% sure he knows what that actually means).We try to keep home time relaxed (he doesn't do any special after school activities) in the hopes that it will help him but that's just created upset in the mornings because he wants to stay at home instead of going to school, and clinging to me at drop off time.Has anyone else navigated a situation like this? How did you help your child cope? via /r/Parenting http://ift.tt/2jWB63Q